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{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
| name = 1719 Jens
| name = 1719 Jens
| background = #D6D6D6
| background = #D6D6D6
| image =
| image = 001719-asteroid shape model (1719) Jens.png
| caption =
| image_scale =
| caption = Shape model of ''Jens'' from its [[lightcurve]]
| discovery_ref = &thinsp;<ref name="jpldata" />
| discovery_ref = <ref name="jpldata" />
| discovered = 17 February 1950
| discovered = 17 February 1950
| discoverer = [[Karl Reinmuth|K. Reinmuth]]
| discoverer = [[Karl Reinmuth|K. Reinmuth]]
| discovery_site = [[Heidelberg-Königstuhl State Observatory|Heidelberg Obs.]]
| discovery_site = [[Heidelberg-Königstuhl State Observatory|Heidelberg Obs.]]
| mp_name = 1719 Jens
| mpc_name = (1719) Jens
| alt_names = 1950 DP{{·}}1939 PP<br />1939 TD{{·}}1941 BB<br />1948 RQ{{·}}{{mp|1948 RS|1}}<br />{{mp|1948 TS|1}}{{·}}{{mp|1961 TZ|1}}<br />A922 SC
| alt_names = 1950 DP{{·}}1939 PP<br />1939 TD{{·}}1941 BB<br />1948 RQ{{·}}{{mp|1948 RS|1}}<br />{{mp|1948 TS|1}}{{·}}{{mp|1961 TZ|1}}<br />A922 SC
| named_after = Jens {{small|(discoverer's grandson)}}<ref name="springer" />
| named_after = Jens {{small|(discoverer's grandson)}}<ref name="springer" />
| mp_category = [[main-belt]]{{·}}{{small|([[Kirkwood gap|middle]])}}&thinsp;<ref name="lcdb" />
| mp_category = [[main-belt]]{{·}}{{small|([[Kirkwood gap|middle]])}}<ref name="lcdb" />
| orbit_ref = &thinsp;<ref name="jpldata" />
| orbit_ref = <ref name="jpldata" />
| epoch = 16 February 2017 ([[Julian day|JD]] 2457800.5)
| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5)
| uncertainty = 0
| uncertainty = 0
| observation_arc = 67.75 yr (24,747 days)
| observation_arc = 68.65 yr (25,074 days)
| aphelion = 3.2467 [[Astronomical unit|AU]]
| aphelion = 3.2474 [[Astronomical unit|AU]]
| perihelion = 2.0648 AU
| perihelion = 2.0649 AU
| semimajor = 2.6558 AU
| semimajor = 2.6562 AU
| eccentricity = 0.2225
| eccentricity = 0.2226
| period = 4.33 [[Julian year (astronomy)|yr]] (1,581 days)
| period = 4.33 [[Julian year (astronomy)|yr]] (1,581 days)
| mean_anomaly = 276.05[[Degree (angle)|°]]
| mean_anomaly = 321.62[[Degree (angle)|°]]
| mean_motion = {{Deg2DMS|0.2277|sup=ms}} / day
| mean_motion = {{Deg2DMS|0.2277|sup=ms}} / day
| inclination = 14.282°
| inclination = 14.281°
| asc_node = 323.44°
| asc_node = 323.44°
| arg_peri = 58.123°
| arg_peri = 58.096°
| dimensions = 18.76 km {{small|(derived)}}<ref name="lcdb" /><br />{{val|18.93|0.9}} km<ref name="SIMPS" /><br />{{val|19.77|0.76}} km<ref name="Masiero-2012" /><br />{{val|19.914|0.070}} km<ref name="WISE" /><br />{{val|21.610|0.086}}<ref name="Masiero-2011" />
| dimensions = 18.76 km {{small|(derived)}}<ref name="lcdb" /><br />{{val|18.93|0.9}} km<ref name="SIMPS" /><br />{{val|19.77|0.76}} km<ref name="Masiero-2012" /><br />{{val|19.914|0.070}} km<ref name="WISE" /><br />{{val|21.610|0.086}}<ref name="Masiero-2011" />
| rotation = {{val|5.867|0.005}} [[Hour|h]]<ref name="Warner-2001a" /><br />{{val|5.87|0.01}} h<ref name="Warner-2011g" /><br />{{val|5.87016|0.00005}} h<ref name="Hanus-2011" /><br />{{val|5.873|0.005}} h<ref name="geneva-obs" />
| rotation = {{val|5.867|0.005}} [[Hour|h]]<ref name="Warner-2001a" /><br />{{val|5.87|0.01}} h<ref name="Warner-2011g" /><br />{{val|5.87016|0.00005}} h<ref name="Hanus-2011" /><br />{{val|5.873|0.005}} h<ref name="geneva-obs" />
| albedo = {{val|0.085|0.011}}<ref name="Masiero-2011" /><br />0.1048 {{small|(derived)}}<ref name="lcdb" /><br />{{val|0.1348|0.0306}}<ref name="WISE" /><br />{{val|0.137|0.021}}<ref name="Masiero-2012" /><br />{{val|0.1489|0.015}}<ref name="SIMPS" />
| albedo = {{val|0.085|0.011}}<ref name="Masiero-2011" /><br />0.1048 {{small|(derived)}}<ref name="lcdb" /><br />{{val|0.1348|0.0306}}<ref name="WISE" /><br />{{val|0.137|0.021}}<ref name="Masiero-2012" /><br />{{val|0.1489|0.015}}<ref name="SIMPS" />
| spectral_type = [[C-type asteroid|C]]&thinsp;<ref name="Veres-2015" />{{·}}[[S-type asteroid|S]]&thinsp;<ref name="lcdb" />
| spectral_type = [[C-type asteroid|C]]<ref name="Veres-2015" />{{·}}[[S-type asteroid|S]]<ref name="lcdb" />
| abs_magnitude = 11.3<ref name="SIMPS" /><ref name="Masiero-2012" /><ref name="WISE" />{{·}}11.7<ref name="jpldata" /><ref name="lcdb" />{{·}}{{val|12.04|1.20}}<ref name="Veres-2015" />
| abs_magnitude = 11.3<ref name="SIMPS" /><ref name="Masiero-2012" /><ref name="WISE" />{{·}}11.7<ref name="jpldata" /><ref name="lcdb" />{{·}}{{val|12.04|1.20}}<ref name="Veres-2015" />
}}
}}


'''1719 Jens''', provisional designation {{mpf|1950 DP}}, is an [[asteroid]] from the middle region of the [[asteroid belt]], approximately 19 kilometers in diameter. It was discovered on 17 February 1950, by German astronomer [[Karl Reinmuth]] at [[Heidelberg-Königstuhl State Observatory|Heidelberg Observatory]] in southern Germany.<ref name="MPC-Jens" />
'''1719 Jens''' ([[Minor planet provisional designation|''prov. designation'']]: {{mp|1950 DP}}) is a [[background asteroid]] from the central region of the [[asteroid belt]], approximately 19 kilometers in diameter. It was discovered on 17 February 1950, by German astronomer [[Karl Reinmuth]] at [[Heidelberg Observatory]] in southern Germany.<ref name="MPC-Jens" /> It was named after a grandson of the discoverer.<ref name="springer" />


== Orbit and classification ==
[[File:(1719) Jens, asteroid, passing in front of Tadpole nebula.jpg|thumb|200px|left|''Jens'' (yellow-green dots) transists near the center of the Tadpole Nebula.]]
[[File:(1719) Jens, asteroid, passing in front of Tadpole nebula.jpg|thumb|200px|left|''Jens'' (yellow-green dots) transists near the center of the Tadpole Nebula.]]


It orbits the Sun at a distance of 2.1–3.2&nbsp;[[Astronomical unit|AU]] once every 4 years and 4 months (1,581 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.22 and an [[orbital inclination|inclination]] of 14[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> First identified as {{mpf|A922 SC}} at [[Simeiz Observatory]] in 1922, ''Jens''{{'s}} first used observation was taken at [[Turku Observatory|Turku]] in 1948, extending the body's [[observation arc]] by 2 years prior to its official discovery observation.<ref name="MPC-Jens" />
''Jens'' orbits the Sun in the [[Kirkwood gap|central]] main-belt at a distance of 2.1–3.2&nbsp;[[Astronomical unit|AU]] once every 4 years and 4 months (1,581 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.22 and an [[orbital inclination|inclination]] of 14[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> First identified as {{mp|A922 SC}} at [[Simeiz Observatory]] in 1922, ''Jens''{{'s}} first used observation was taken at [[Turku Observatory|Turku]] in 1948, extending the body's [[observation arc]] by 2 years prior to its official discovery observation.<ref name="MPC-Jens" />


In 2010, ''Jens'' was passing in front of the Tadpole Nebula ''(see image obtained by [[Wide-field Infrared Survey Explorer|WISE]])''.<ref name="tadpole-image" />
In 2010, ''Jens'' was passing in front of the Tadpole Nebula ''(see image obtained by [[Wide-field Infrared Survey Explorer|WISE]])''.<ref name="tadpole-image" />


== Physical characteristics ==
⚫
In September 2000, American astronomer [[Brian D. Warner]] obtained two rotational [[light-curve]]s, giving a [[rotation period]] of 5.867 and 5.87 hours with a brightness variation of 0.50 and 0.55 [[Magnitude (astronomy)|magnitude]], respectively ({{small|[[LCDB quality code|U=3/3]]}}).<ref name="Warner-2001a" /><ref name="Warner-2011g" /> In February 2006, photometric observations by French amateur astronomer [[Laurent Bernasconi]] gave a concurring period of 5.873 hours with an amplitude of 0.55 magnitude ({{small|[[LCDB quality code|U=3]]}}).<ref name="geneva-obs" /> This well-defined period was further confirmed by a modeled light-curve using data from the Lowell Photometric Database, giving a period of 5.87016 hours ({{small|[[LCDB quality code|U=n.a.]]}}).<ref name="Hanus-2011" />


=== Lightcurves ===
⚫
It is classified as [[S-type asteroid|S-]] and [[C-type asteroid|C-type]] asteroid by the LCDB and [[Pan-STARRS]], respectively. According to the surveys carried out by the Infrared Astronomical Satellite [[IRAS]] and NASA's [[Wide-field Infrared Survey Explorer]] with its subsequent [[NEOWISE]] mission, ''Jens'' measures between 18.93 and 21.61 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] between 0.085 and 0.149.<ref name="SIMPS" /><ref name="Masiero-2012" /><ref name="WISE" /> The ''Collaborative Asteroid Lightcurve Link'' derives an albedo of 0.1048 and calculates a diameter of 18.76 kilometers based on an absolute magnitude of 11.7.<ref name="lcdb" />


In September 2000, American astronomer [[Brian D. Warner|Brian Warner]] obtained two rotational [[lightcurve]]s, giving a [[rotation period]] of 5.867 and 5.87 hours with a brightness variation of 0.50 and 0.55 [[Magnitude (astronomy)|magnitude]], respectively ({{small|[[LCDB quality code|U=3/3]]}}).<ref name="Warner-2001a" /><ref name="Warner-2011g" />
⚫
This minor planet was named by the discoverer for his grandson. Karl Reinmuth also named the consecutively numbered asteroid, [[1720 Niels]], after one of his grandsons.<ref name="springer" /> Naming citation was published before November 1977 ({{small|[[Minor Planet Circulars|M.P.C.]] 3933}}).<ref name="MPC-Circulars-Archive" />

⚫
In February 2006, photometric observations by French amateur astronomer [[Laurent Bernasconi]] gave a concurring period of 5.873 hours with an amplitude of 0.55 magnitude ({{small|[[LCDB quality code|U=3]]}}).<ref name="geneva-obs" /> This well-defined period was further confirmed by a modeled light-curve using data from the Lowell Photometric Database, giving a period of 5.87016 hours ({{small|[[LCDB quality code|U=n.a.]]}}).<ref name="Hanus-2011" />

=== Spectral type ===

It is classified as [[S-type asteroid|S-]] and [[C-type asteroid|C-type]] asteroid by the LCDB and [[Pan-STARRS]], respectively.<ref name="lcdb" /><ref name="Veres-2015" />

=== Diameter and albedo ===

⚫
According to the surveys carried out by the Infrared Astronomical Satellite [[IRAS]] and NASA's [[Wide-field Infrared Survey Explorer]] with its subsequent [[NEOWISE]] mission, ''Jens'' measures between 18.93 and 21.61 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] between 0.085 and 0.149.<ref name="SIMPS" /><ref name="Masiero-2012" /><ref name="WISE" /> The ''Collaborative Asteroid Lightcurve Link'' derives an albedo of 0.1048 and calculates a diameter of 18.76 kilometers based on an absolute magnitude of 11.7.<ref name="lcdb" />

== Naming ==

⚫
This [[minor planet]] was named by the discoverer for his grandson. Karl Reinmuth also named the consecutively numbered asteroid, [[1720 Niels]], after one of his grandsons.<ref name="springer" /> The official {{MoMP|1719|naming citation}} was published by the [[Minor Planet Center]] on 20 February 1976 ({{small|[[Minor Planet Circulars|M.P.C.]] 3933}}).<ref name="DoMP-Circular-dates" />


== References ==
== References ==
{{reflist
{{reflist|30em|refs=
|refs=


<ref name="jpldata">{{cite web
<ref name="jpldata">{{cite web
|type = 2016-06-12 last obs.
|type = 2017-05-05 last obs.
|title = JPL Small-Body Database Browser: 1719 Jens (1950 DP)
|title = JPL Small-Body Database Browser: 1719 Jens (1950 DP)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001719
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001719
|publisher = Jet Propulsion Laboratory
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 22 December 2016}}</ref>
|access-date = 7 June 2017}}</ref>


<ref name="springer">{{cite book
<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (1719) Jens
|title = Dictionary of Minor Planet Names – (1719) Jens
|last = Schmadel | first = Lutz D.
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|publisher = [[Springer Berlin Heidelberg]]
|page = 136
|page = 136
|date = 2007
|date = 2007
|url = http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1720
|isbn = 978-3-540-00238-3
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1720 |chapter = (1719) Jens }}</ref>
|accessdate = 22 December 2016}}</ref>


<ref name="MPC-Jens">{{cite web
<ref name="MPC-Jens">{{cite web
|title = 1719 Jens (1950 DP)
|title = 1719 Jens (1950 DP)
|work = Minor Planet Center
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1719
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1719
|accessdate = 22 December 2016}}</ref>
|access-date = 22 December 2016}}</ref>


<ref name="MPC-Circulars-Archive">{{cite web
<ref name="DoMP-Circular-dates">{{cite book
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|title = MPC/MPO/MPS Archive
|chapter = Appendix – Publication Dates of the MPCs
|work = Minor Planet Center
|last = Schmadel |first=Lutz D.
|url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|publisher = Springer Berlin Heidelberg
|accessdate = 22 December 2016}}</ref>
|page = 221
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4}}</ref>


<ref name="geneva-obs">{{cite web
<ref name="geneva-obs">{{cite web
|title = Asteroids and comets rotation curves – (1719) Jens
|title = Asteroids and comets rotation curves – (1719) Jens
|last = Behrend |first = Raoul
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|publisher = [[Geneva Observatory]]
|url = http://obswww.unige.ch/~behrend/page4cou.html#001719
|url = http://obswww.unige.ch/~behrend/page4cou.html#001719
|accessdate = 22 December 2016}}</ref>
|access-date = 22 December 2016}}</ref>


<ref name="tadpole-image">{{cite web
<ref name="tadpole-image">{{cite web
Line 93: Line 112:
|date = 13 May 2010
|date = 13 May 2010
|url = http://photojournal.jpl.nasa.gov/catalog/PIA13110
|url = http://photojournal.jpl.nasa.gov/catalog/PIA13110
|accessdate = 15 November 2015}}</ref>
|access-date = 15 November 2015}}</ref>


<ref name="lcdb">{{cite web
<ref name="lcdb">{{cite web
|title = LCDB Data for (1719) Jens
|title = LCDB Data for (1719) Jens
|publisher = Asteroid Lightcurve Database (LCDB)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1719%7CJens
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1719%7CJens
|accessdate = 22 December 2016}}</ref>
|access-date = 22 December 2016}}</ref>


<ref name="SIMPS">{{cite journal
<ref name="SIMPS">{{cite journal
Line 108: Line 127:
|date = October 2004
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|title = IRAS Minor Planet Survey V6.0
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004PDSS...12.....T
|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal = NASA Planetary Data System
|journal = NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|bibcode = 2004PDSS...12.....T
|access-date= 22 December 2016}}</ref>
|access-date = 17 October 2019}}</ref>


<ref name="WISE">{{cite journal
<ref name="WISE">{{cite journal
Line 130: Line 149:
|date = November 2011
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://arxiv.org/pdf/1109.6407v1.pdf
|journal = The Astrophysical Journal
|journal = The Astrophysical Journal
|volume = 741
|volume = 741
Line 137: Line 155:
|bibcode = 2011ApJ...741...90M
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407
|arxiv = 1109.6407}}</ref>
|access-date= 22 December 2016}}</ref>


<ref name="Masiero-2012">{{cite journal
<ref name="Masiero-2012">{{cite journal
Line 207: Line 224:
|journal = Astronomy & Astrophysics
|journal = Astronomy & Astrophysics
|volume = 530
|volume = 530
|pages = 16
|page = 16
|bibcode = 2011A&A...530A.134H
|bibcode = 2011A&A...530A.134H
|doi = 10.1051/0004-6361/201116738
|doi = 10.1051/0004-6361/201116738
Line 260: Line 277:
|first14 = E. |last14 = DeBaun
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first15 = D. |last15 = Elsbury
|first16 = T., IV |last16 = Gautier
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|first18 = A. |last18 = Wilkins
Line 278: Line 295:


== External links ==
== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [http://www.minorplanetobserver.com/pdolc/A1719_2000.HTM Lightcurve plot of 1719 Jens], Palmer Divide Observatory, ''[[Brian D. Warner|B. D. Warner]]'' (2000)
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{AstDys|1719}}
* {{JPL small body}}
* {{JPL small body}}


{{Minor planets navigator|1718 Namibia|number=1719|1720 Niels}}
{{Minor planets navigator |1718 Namibia |number=1719 |1720 Niels}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}
{{Authority control}}


{{DEFAULTSORT:Jens}}
{{DEFAULTSORT:Jens}}
[[Category:Main-belt asteroids|001719]]
[[Category:Background asteroids|001719]]
[[Category:Numbered minor planets|001719]]
[[Category:Discoveries by Karl Wilhelm Reinmuth]]
[[Category:Discoveries by Karl Wilhelm Reinmuth]]
[[Category:Minor planets named for people]]
[[Category:Named minor planets]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 1950|19500217]]
[[Category:Astronomical objects discovered in 1950|19500217]]

Latest revision as of 14:29, 17 August 2024

1719 Jens
Shape model of Jens from its lightcurve
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date17 February 1950
Designations
(1719) Jens
Named after
Jens (discoverer's grandson)[2]
1950 DP · 1939 PP
1939 TD · 1941 BB
1948 RQ · 1948 RS1
1948 TS1 · 1961 TZ1
A922 SC
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc68.65 yr (25,074 days)
Aphelion3.2474 AU
Perihelion2.0649 AU
2.6562 AU
Eccentricity0.2226
4.33 yr (1,581 days)
321.62°
0° 13m 39.72s / day
Inclination14.281°
323.44°
58.096°
Physical characteristics
Dimensions18.76 km (derived)[3]
18.93±0.9 km[4]
19.77±0.76 km[5]
19.914±0.070 km[6]
21.610±0.086[7]
5.867±0.005 h[8]
5.87±0.01 h[9]
5.87016±0.00005 h[10]
5.873±0.005 h[11]
0.085±0.011[7]
0.1048 (derived)[3]
0.1348±0.0306[6]
0.137±0.021[5]
0.1489±0.015[4]
C[12] · S[3]
11.3[4][5][6] · 11.7[1][3] · 12.04±1.20[12]

1719 Jens (prov. designation: 1950 DP) is a background asteroid from the central region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 17 February 1950, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[13] It was named after a grandson of the discoverer.[2]

Orbit and classification

[edit]
Jens (yellow-green dots) transists near the center of the Tadpole Nebula.

Jens orbits the Sun in the central main-belt at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,581 days). Its orbit has an eccentricity of 0.22 and an inclination of 14° with respect to the ecliptic.[1] First identified as A922 SC at Simeiz Observatory in 1922, Jens's first used observation was taken at Turku in 1948, extending the body's observation arc by 2 years prior to its official discovery observation.[13]

In 2010, Jens was passing in front of the Tadpole Nebula (see image obtained by WISE).[14]

Physical characteristics

[edit]

Lightcurves

[edit]

In September 2000, American astronomer Brian Warner obtained two rotational lightcurves, giving a rotation period of 5.867 and 5.87 hours with a brightness variation of 0.50 and 0.55 magnitude, respectively (U=3/3).[8][9]

In February 2006, photometric observations by French amateur astronomer Laurent Bernasconi gave a concurring period of 5.873 hours with an amplitude of 0.55 magnitude (U=3).[11] This well-defined period was further confirmed by a modeled light-curve using data from the Lowell Photometric Database, giving a period of 5.87016 hours (U=n.a.).[10]

Spectral type

[edit]

It is classified as S- and C-type asteroid by the LCDB and Pan-STARRS, respectively.[3][12]

Diameter and albedo

[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Jens measures between 18.93 and 21.61 kilometers in diameter and its surface has an albedo between 0.085 and 0.149.[4][5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1048 and calculates a diameter of 18.76 kilometers based on an absolute magnitude of 11.7.[3]

Naming

[edit]

This minor planet was named by the discoverer for his grandson. Karl Reinmuth also named the consecutively numbered asteroid, 1720 Niels, after one of his grandsons.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933).[15]

References

[edit]
  1. ^ a b c d "JPL Small-Body Database Browser: 1719 Jens (1950 DP)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1719) Jens". Dictionary of Minor Planet Names – (1719) Jens. Springer Berlin Heidelberg. p. 136. doi:10.1007/978-3-540-29925-7_1720. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1719) Jens". Asteroid Lightcurve Database (LCDB). Retrieved 22 December 2016.
  4. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 22 December 2016.
  6. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  7. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 22 December 2016.
  8. ^ a b Warner, B. (March 2001). "Asteroid Photometry at the Palmer Divide Observatory: Results for 706 Hirundo, 957 Camelia, and 1719 Jens". The Minor Planet Bulletin. 28: 4–5. Bibcode:2001MPBu...28....4W. Retrieved 22 December 2016.
  9. ^ a b Warner, Brian D. (January 2011). "Upon Further Review: V. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 38 (1): 63–65. Bibcode:2011MPBu...38...63W. ISSN 1052-8091. Retrieved 22 December 2016.
  10. ^ a b Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 22 December 2016.
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1719) Jens". Geneva Observatory. Retrieved 22 December 2016.
  12. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 22 December 2016.
  13. ^ a b "1719 Jens (1950 DP)". Minor Planet Center. Retrieved 22 December 2016.
  14. ^ "Asteroid Caught Marching Across Tadpole Nebula". JPL Photojournal. 13 May 2010. Retrieved 15 November 2015.
  15. ^ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
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