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| period = 5.59 [[Julian year (astronomy)|yr]] (2040.1 [[Julian year (astronomy)|d]])
| period = 5.59 [[Julian year (astronomy)|yr]] (2040.1 [[Julian year (astronomy)|d]])
| mean_anomaly = 76.789[[Degree (angle)|°]]
| mean_anomaly = 76.789[[Degree (angle)|°]]
| mean_motion = {{Deg2DMS|0.1765|sup=ms}} / day
| inclination = 2.4737°
| inclination = 2.4737°
| asc_node = 106.25°
| asc_node = 106.25°
| arg_peri = 135.99°
| arg_peri = 135.99°
| dimensions = 20.51 km {{small|(calculated)}}<ref name="lcdb" /><br />{{val|20.623|0.240}} km<ref name="WISE" />
| moid = {{Convert|1.73349|AU|Gm|abbr=on}}
| dimensions = {{val|20.623|0.240}}<ref name="WISE" /><br />20.51 km {{small|(calculated)}}<ref name="lcdb" />
| rotation = {{val|4.82|0.05}} [[Hour|h]]<ref name="Chang-2014a" /><br />{{val|4.8050|0.0027}} h<ref name="Waszczak-2015" />
| rotation = {{val|4.82|0.05}} [[hour|h]]<ref name="Chang-2014a" /><br />{{val|4.8050|0.0027}} h<ref name="Waszczak-2015" /><br />{{Convert|4.82|h|d|abbr=on|lk=on}}<ref name="jpldata"/>
| albedo = {{val|0.095|0.007}}<ref name="WISE" /><br />0.08 {{small|(assumed)}}<ref name="lcdb" />
| albedo = {{val|0.0951|0.0069}}<ref name="WISE" /><br />0.08 {{small|(assumed)}}<ref name="lcdb" />
| spectral_type = [[C-type asteroid|C]]&thinsp;<ref name="lcdb" />
| abs_magnitude = {{val|11.59|0.15}} {{small|(R)}}<ref name="Chang-2014a" /><br />11.6<ref name="WISE" /><br />{{val|11.725|0.003}} {{small|(R)}}<ref name="Waszczak-2015" />11.8<ref name="jpldata" /><ref name="lcdb" /><br />{{val|12.32|0.54}}<ref name="Veres-2015" />
| spectral_type = [[C-type asteroid|C]] <ref name="lcdb" />
| abs_magnitude = 11.8<ref name="jpldata" />
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5)
| mean_motion = {{Deg2DMS|0.17646|sup=ms}} / day
| jupiter_moid = {{Convert|1.4615|AU|Gm|abbr=on}}
| tisserand = 3.194
}}
}}


'''1778 Alfvén''', also designated 4506 P-L, is a carbonaceous Themistian [[asteroid]] from the outer region of the [[asteroid belt]]. It was discovered on 26 September 1960, by astronomers [[Cornelis van Houten]], [[Ingrid van Houten-Groeneveld]] and [[Tom Gehrels]] at Palomar, in San Diego, United States.<ref name="MPC-Alfven" />
'''1778 Alfvén''', also designated 4506 P-L, is a carbonaceous Themistian [[asteroid]] from the outer region of the [[asteroid belt]], approximately 20 kilometers in diameter. It was discovered on 26 September 1960, by astronomers [[Cornelis van Houten]], [[Ingrid van Houten-Groeneveld]] and [[Tom Gehrels]] at the U.S. [[Palomar Observatory]], in California.<ref name="MPC-Alfven" />


The asteroid is a member of the [[Themis family]] and has a calculated diameter of about 21 kilometers.<ref name="lcdb" /> It orbits the Sun at a distance of 2.7–3.5&nbsp;[[Astronomical unit|AU]] once every 5 years and 7 months (2,040 days). Its orbit shows an [[orbital eccentricity|eccentricity]] of 0.13 and is [[orbital inclination|tilted]] by 2 degrees towards the plane of the [[ecliptic]].<ref name="jpldata" /> It has a [[rotation period]] of 4.82 hours, measured in 2013.<ref name="Chang-2014a" /><ref name="Waszczak-2015" /> Based on assumptions made by the Collaborative Asteroid Lightcurve Link, the [[geometric albedo|albedo]] of the [[C-type asteroid|C-type]] asteroid is around 0.08,<ref name="lcdb" /> while the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], finds an albedo of 0.095 and a diameter of 20.6 kilometers.<ref name="WISE" />
The dark [[C-type asteroid|C-type]] asteroid is a member of the [[Themis family]], a dynamical family of outer-belt asteroids with nearly coplanar [[ecliptic|ecliptical orbits]]. ''Alfvén'' orbits the Sun at a distance of 2.7–3.6&nbsp;[[Astronomical unit|AU]] once every 5 years and 7 months (2,040 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.13 and an [[orbital inclination|inclination]] of 2[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The first [[precovery]] was taken at [[Lowell Observatory]] in 1909. Its first used observation was also a precovery taken at [[Palomar Observatory]] in 1954, extending the body's [[observation arc]] by 6 years prior to its official discovery observation.<ref name="MPC-Alfven" />


In February 2013, two rotational [[light-curve]]s of ''Alfvén'' were obtained from analysis at the [[Palomar Transient Factory]] in California. The light-curves gave a [[rotation period]] of 4.82 and 4.8050 hours with a brightness variation of 0.40 and 0.36 [[Magnitude (astronomy)|magnitude]], respectively ({{small|[[LCDB quality code|U=3-/2]]}}).<ref name="Chang-2014a" /><ref name="Waszczak-2015" />
The designation ''P-L'' stands for ''Palomar–Leiden'', named after [[Palomar Observatory]] and [[Leiden Observatory]], which collaborated on the fruitful [[Palomar–Leiden survey]] in the 1960s. Gehrels used Palomar's [[Samuel Oschin telescope]] (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.


According to the survey carried out by NASA's [[Wide-field Infrared Survey Explorer]] with its subsequent [[NEOWISE]] mission, ''Alfvén'' measures 20.62 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] of 0.095, <ref name="WISE" /> while the ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.08 and calculates a diameter of 20.51 kilometers based on an absolute magnitude of 11.8.<ref name="lcdb" />
The asteroid was named after Swedish engineer, physicist and Nobel prize winner, [[Hannes Alfvén]] (1908–1995).<ref name="springer" />

The [[survey designation]] "P-L" stands for ''Palomar–Leiden'', named after Palomar Observatory and [[Leiden Observatory]], which collaborated on the fruitful [[Palomar–Leiden survey]] in the 1960s. Gehrels used Palomar's [[Samuel Oschin telescope]] (also known as the 48-inch Schmidt Telescope), and shipped the [[photographic plate]]s to Ingrid and Cornelis van Houten at Leiden Observatory where [[astrometry]] was carried out. The trio are credited with the discovery of 4,620 minor planets.<ref name="MPC-discoverers" />

The asteroid was named after Swedish engineer, physicist and Nobel prize winner, [[Hannes Alfvén]] (1908–1995).<ref name="springer" /> Naming citation was published before November 1977 ({{small|[[Minor Planet Circulars|M.P.C.]] 3643}}).<ref name="MPC-Circulars-Archive" />


== References ==
== References ==
{{reflist
{{reflist
|refs=
|refs=

<ref name="lcdb">{{cite web
|title=LCDB Data for (1778) Alfven
|author=Warner
|display-authors=etal
|date=2009
|publisher=Asteroid Lightcurve Database (LCDB)
|url=http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1778%7CAlfven
|accessdate=17 November 2015}}</ref>


<ref name="jpldata">{{cite web
<ref name="jpldata">{{cite web
|type=2015-10-24 last obs.
|type = 2016-11-08 last obs.
|title=JPL Small-Body Database Browser: 1778 Alfven (4506 P-L)
|title = JPL Small-Body Database Browser: 1778 Alfven (4506 P-L)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001778
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001778
|publisher=Jet Propulsion Laboratory
|publisher = Jet Propulsion Laboratory
|accessdate=20 April 2016}}</ref>
|accessdate = 19 December 2016}}</ref>


<ref name="springer">{{cite book
<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (1778) Alfvén
|url=http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1779
|last = Schmadel | first = Lutz D.
|title=Dictionary of Minor Planet Names – (1778) Alfvén
|publisher = Springer Berlin Heidelberg
|last=Schmadel |first=Lutz D.
|page = 142
|publisher=Springer Berlin Heidelberg
|date = 2007
|page=142
|url = http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1779
|date=2003
|isbn=978-3-540-29925-7
|isbn = 978-3-540-00238-3
|accessdate=15 October 2015}}</ref>
|accessdate = 19 December 2016}}</ref>


<ref name="MPC-Alfven">{{cite web
<ref name="MPC-Alfven">{{cite web
|title=1778 Alfven (4506 P-L)
|title = 1778 Alfven (4506 P-L)
|work=Minor Planet Center
|work = Minor Planet Center
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=1778
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1778
|accessdate=17 November 2015}}</ref>
|accessdate = 19 December 2016}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 19 December 2016}}</ref>

<ref name="MPC-discoverers">{{cite web
|title = Minor Planet Discoverers
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html
|date = 24 April 2016
|accessdate = 19 December 2016}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (1778) Alfvén
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1778%7CAlfvén
|accessdate = 19 December 2016}}</ref>


<ref name="WISE">{{cite journal
<ref name="WISE">{{cite journal
Line 98: Line 108:
|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://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|url = http://arxiv.org/pdf/1109.6407v1.pdf
|journal = The Astrophysical Journal
|journal = The Astrophysical Journal
|volume = 741
|volume = 741
Line 105: Line 115:
|bibcode = 2011ApJ...741...90M
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|doi = 10.1088/0004-637X/741/2/90
|access-date= 1 April 2016|arxiv = 1109.6407 }}</ref>
|arxiv = 1109.6407
|access-date= 19 December 2016}}</ref>


<ref name="Chang-2014a">{{cite journal
<ref name="Chang-2014a">{{cite journal
|display-authors = 6
|display-authors = 6
|author = Chang, Chan-Kao
|first1 = Chan-Kao |last1 = Chang
|author2 = Ip, Wing-Huen
|first2 = Wing-Huen |last2 = Ip
|author3 = Lin, Hsing-Wen
|first3 = Hsing-Wen |last3 = Lin
|author4 = Cheng, Yu-Chi
|first4 = Yu-Chi |last4 = Cheng
|author5 = Ngeow, Chow-Choong
|first5 = Chow-Choong |last5 = Ngeow
|author6 = Yang, Ting-Chang
|first6 = Ting-Chang |last6 = Yang
|author7 = Waszczak, Adam
|first7 = Adam |last7 = Waszczak
|author8 = Kulkarni, Shrinivas R.
|first8 = Shrinivas R. |last8 = Kulkarni
|author9 = Levitan, David
|first9 = David |last9 = Levitan
|author10 = Sesar, Branimir
|first10 = Branimir |last10 = Sesar
|author11 = Laher, Russ
|first11 = Russ |last11 = Laher
|author12 = Surace, Jason
|first12 = Jason |last12 = Surace
|author13 = Prince, Thomas. A.
|first13 = Thomas. A. |last13 = Prince
|date = June 2014
|date = June 2014
|title = 313 New Asteroid Rotation Periods from Palomar Transient Factory Observations
|title = 313 New Asteroid Rotation Periods from Palomar Transient Factory Observations
Line 131: Line 142:
|bibcode = 2014ApJ...788...17C
|bibcode = 2014ApJ...788...17C
|doi = 10.1088/0004-637X/788/1/17
|doi = 10.1088/0004-637X/788/1/17
|access-date= 17 November 2015|arxiv = 1405.1144 }}</ref>
|arxiv = 1405.1144
|access-date= 19 December 2016}}</ref>


<ref name="Waszczak-2015">{{cite journal
<ref name="Waszczak-2015">{{cite journal
|display-authors = 6
|display-authors = 6
|author = Waszczak, Adam
|first1 = Adam |last1 = Waszczak
|author2 = Chang, Chan-Kao
|first2 = Chan-Kao |last2 = Chang
|author3 = Ofek, Eran O.
|first3 = Eran O. |last3 = Ofek
|author4 = Laher, Russ
|first4 = Russ |last4 = Laher
|author5 = Masci, Frank
|first5 = Frank |last5 = Masci
|author6 = Levitan, David
|first6 = David |last6 = Levitan
|author7 = Surace, Jason
|first7 = Jason |last7 = Surace
|author8 = Cheng, Yu-Chi
|first8 = Yu-Chi |last8 = Cheng
|author9 = Ip, Wing-Huen
|first9 = Wing-Huen |last9 = Ip
|author10 = Kinoshita, Daisuke
|first10 = Daisuke |last10 = Kinoshita
|author11 = Helou, George
|first11 = George |last11 = Helou
|author12 = Prince, Thomas A.
|first12 = Thomas A. |last12 = Prince
|author13 = Kulkarni, Shrinivas
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
Line 157: Line 169:
|bibcode = 2015AJ....150...75W
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|doi = 10.1088/0004-6256/150/3/75
|access-date= 17 November 2015|arxiv = 1504.04041 }}</ref>
|arxiv = 1504.04041
|access-date= 19 December 2016}}</ref>

<ref name="Veres-2015">{{cite journal
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 19 December 2016}}</ref>


}} <!-- end of reflist -->
}} <!-- end of reflist -->
Line 163: Line 206:
== 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.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [https://books.google.se/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
* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
Line 174: Line 217:
[[Category:Themistian asteroids|001778]]
[[Category:Themistian asteroids|001778]]
[[Category:Numbered minor planets|001778]]
[[Category:Numbered minor planets|001778]]
[[Category:Discoveries by Ingrid van Houten-Groeneveld]]
[[Category:Discoveries by Cornelis Johannes van Houten]]
[[Category:Discoveries by Tom Gehrels]]
[[Category:Discoveries by the Palomar–Leiden survey|4506]]
[[Category:Minor planets named for people]]
[[Category:Minor planets named for people]]
[[Category:Named minor planets]]
[[Category:Named minor planets]]
[[Category:Discoveries by the Palomar–Leiden survey|4506]]
[[Category:Discoveries by Cornelis Johannes van Houten]]
[[Category:Discoveries by Ingrid van Houten-Groeneveld]]
[[Category:Discoveries by Tom Gehrels]]
[[Category:Astronomical objects discovered in 1960|19600926]]
[[Category:Astronomical objects discovered in 1960|19600926]]


{{Beltasteroid-stub}}

Revision as of 23:49, 19 December 2016

1778 Alfvén
Discovery [1]
Discovered byC. J. van Houten
I. van Houten-G.
Tom Gehrels
Discovery sitePalomar Obs.
Discovery date26 September 1960
Designations
1778 Alfvén
Named after
Hannes Alfvén
(physicist)[2]
4506 P-L · 1936 HK
1952 DD1 · 1958 FB
1959 NN
main-belt · Themis [3]
Orbital characteristics [1]
Uncertainty parameter 0
Observation arc61.19 yr (22351 days)
Aphelion3.5493 AU (530.97 Gm)
Perihelion2.7466 AU (410.89 Gm)
3.1480 AU (470.93 Gm)
Eccentricity0.12749
5.59 yr (2040.1 d)
76.789°
0° 10m 35.4s / day
Inclination2.4737°
106.25°
135.99°
Physical characteristics
Dimensions20.51 km (calculated)[3]
20.623±0.240 km[4]
4.82±0.05 h[5]
4.8050±0.0027 h[6]
0.095±0.007[4]
0.08 (assumed)[3]
C [3]
11.59±0.15 (R)[5]
11.6[4]
11.725±0.003 (R)[6]11.8[1][3]
12.32±0.54[7]

1778 Alfvén, also designated 4506 P-L, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 26 September 1960, by astronomers Cornelis van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at the U.S. Palomar Observatory, in California.[8]

The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. Alfvén orbits the Sun at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,040 days). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic.[1] The first precovery was taken at Lowell Observatory in 1909. Its first used observation was also a precovery taken at Palomar Observatory in 1954, extending the body's observation arc by 6 years prior to its official discovery observation.[8]

In February 2013, two rotational light-curves of Alfvén were obtained from analysis at the Palomar Transient Factory in California. The light-curves gave a rotation period of 4.82 and 4.8050 hours with a brightness variation of 0.40 and 0.36 magnitude, respectively (U=3-/2).[5][6]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Alfvén measures 20.62 kilometers in diameter and its surface has an albedo of 0.095, [4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 20.51 kilometers based on an absolute magnitude of 11.8.[3]

The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of 4,620 minor planets.[9]

The asteroid was named after Swedish engineer, physicist and Nobel prize winner, Hannes Alfvén (1908–1995).[2] Naming citation was published before November 1977 (M.P.C. 3643).[10]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1778 Alfven (4506 P-L)" (2016-11-08 last obs.). Jet Propulsion Laboratory. Retrieved 19 December 2016.
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1778) Alfvén. Springer Berlin Heidelberg. p. 142. ISBN 978-3-540-00238-3. Retrieved 19 December 2016.
  3. ^ a b c d e f "LCDB Data for (1778) Alfvén". Asteroid Lightcurve Database (LCDB). Retrieved 19 December 2016.
  4. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 December 2016.
  5. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (June 2014). "313 New Asteroid Rotation Periods from Palomar Transient Factory Observations". The Astrophysical Journal. 788 (1): 21. arXiv:1405.1144. Bibcode:2014ApJ...788...17C. doi:10.1088/0004-637X/788/1/17. Retrieved 19 December 2016.
  6. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 19 December 2016.
  7. ^ 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 19 December 2016.
  8. ^ a b "1778 Alfven (4506 P-L)". Minor Planet Center. Retrieved 19 December 2016.
  9. ^ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 19 December 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 December 2016.
Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=1778_Alfvén&oldid=755751609"