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{{Short description|Asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
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'''2085 Henan''', provisional designation {{mpf|1965 YA}}, is a potentially slow rotating [[asteroid]] and the parent body of the [[Henan family]] in the central regions of the [[asteroid belt]], approximately 15 kilometers in diameter. It was discovered on 20 December 1965, by astronomers at the the [[Purple Mountain Observatory]] in Nanking, China.<ref name="MPC-object" /> The asteroid was named for the [[Henan Province]] in China.<ref name="springer" />
'''2085 Henan''', provisional designation {{mp|1965 YA}}, is a potentially slow rotating [[asteroid]] and the parent body of the [[Henan family]] in the central regions of the [[asteroid belt]], approximately 15 kilometers in diameter. It was discovered on 20 December 1965, by astronomers at the [[Purple Mountain Observatory]] in Nanking, China.<ref name="MPC-object" /> The asteroid was named for the [[Henan Province]] in China.<ref name="springer" />


== Orbit and classification ==
== Orbit and classification ==
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|type = 2017-11-02 last obs.
|type = 2017-11-02 last obs.
|title = JPL Small-Body Database Browser: 2085 Henan (1965 YA)
|title = JPL Small-Body Database Browser: 2085 Henan (1965 YA)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002085
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002085
|publisher = [[Jet Propulsion Laboratory]]
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 18 November 2017}}</ref>
|accessdate = 18 November 2017}}</ref>


<ref name="springer">{{cite book
<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (2085) Henan
|last = Schmadel | first = Lutz D.
|last = Schmadel | first = Lutz D.
|publisher = [[Springer Berlin Heidelberg]]
|title = Dictionary of Minor Planet Names |publisher = [[Springer Berlin Heidelberg]]
|page = 169
|page = 169
|date = 2007
|date = 2007
|url = https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_2086
|isbn = 978-3-540-00238-3
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_2086 |chapter = (2085) Henan }}</ref>
|accessdate = 18 November 2017}}</ref>


<ref name="MPC-object">{{cite web
<ref name="MPC-object">{{cite web
|title = 2085 Henan (1965 YA)
|title = 2085 Henan (1965 YA)
|work = Minor Planet Center
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2085
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2085
|accessdate = 18 November 2017}}</ref>
|accessdate = 18 November 2017}}</ref>


Line 93: Line 93:
|title = MPC/MPO/MPS Archive
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 18 November 2017}}</ref>
|accessdate = 18 November 2017}}</ref>


Line 114: Line 114:
|date = August 2014
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|url = https://arxiv.org/pdf/1406.6645.pdf
|journal = The Astrophysical Journal
|journal = The Astrophysical Journal
|volume = 791
|volume = 791
Line 121: Line 120:
|bibcode = 2014ApJ...791..121M
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645
|arxiv = 1406.6645}}</ref>
|access-date= 18 November 2017}}</ref>


<ref name="Ferret">{{cite web
<ref name="Ferret">{{cite web
|title = Small Bodies Data Ferret
|title = Asteroid 2085 Henan – Nesvorny HCM Asteroid Families V3.0
|work = Nesvorny HCM Asteroid Families V3.0
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2085+Henan#Asteroid%202085%20HenanEAR-A-VARGBDET-5-NESVORNYFAM-V3.0
|accessdate = 18 November 2017}}</ref>
|accessdate = 26 October 2019}}</ref>


<ref name="Nesvorny-2014">{{Cite journal
<ref name="Nesvorny-2014">{{Cite book
|first1 = D. |last1 = Nesvorný
|first1 = D. |last1 = Nesvorný
|first2 = M. |last2 = Broz
|first2 = M. |last2 = Broz
|first3 = V. |last3 = Carruba
|first3 = V. |last3 = Carruba
|date = December 2014
|date = December 2014
|title = Identification and Dynamical Properties of Asteroid Families
|chapter = Identification and Dynamical Properties of Asteroid Families
⚫
|title = Asteroids IV
|url = https://arxiv.org/pdf/1502.01628.pdf
⚫
|journal = Asteroids IV
|pages = 297–321
|pages = 297–321
|bibcode = 2015aste.book..297N
|bibcode = 2015aste.book..297N
|doi = 10.2458/azu_uapress_9780816532131-ch016
|doi = 10.2458/azu_uapress_9780816532131-ch016
|arxiv = 1502.01628
|arxiv = 1502.01628
|access-date= 18 November 2017}}</ref>
|isbn = 9780816532131}}</ref>


<ref name="lcdb">{{cite web
<ref name="lcdb">{{cite web
|title = LCDB Data for (2085) Henan
|title = LCDB Data for (2085) Henan
|publisher = Asteroid Lightcurve Database (LCDB)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=2085%7CHenan
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2085%7CHenan
|accessdate = 18 November 2017}}</ref>
|accessdate = 18 November 2017}}</ref>


Line 184: Line 181:
|date = September 2016
|date = September 2016
|title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos
|title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016AJ....152...63N
|journal = The Astronomical Journal
|journal = The Astronomical Journal
|volume = 152
|volume = 152
Line 192: Line 188:
|doi = 10.3847/0004-6256/152/3/63
|doi = 10.3847/0004-6256/152/3/63
|arxiv = 1606.08923
|arxiv = 1606.08923
|access-date= 18 November 2017}}</ref>
|doi-access = free }}</ref>


<ref name="AKARI">{{cite journal
<ref name="AKARI">{{cite journal
Line 211: Line 207:
|date = October 2011
|date = October 2011
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html
|journal = Publications of the Astronomical Society of Japan
|journal = Publications of the Astronomical Society of Japan
|volume = 63
|volume = 63
Line 218: Line 213:
|bibcode = 2011PASJ...63.1117U
|bibcode = 2011PASJ...63.1117U
|doi = 10.1093/pasj/63.5.1117
|doi = 10.1093/pasj/63.5.1117
|access-date= 18 November 2017}}</ref>
|doi-access= free
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=2085 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</ref>


<ref name="WISE">{{cite journal
<ref name="WISE">{{cite journal
Line 237: Line 233:
|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 244: Line 239:
|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= 18 November 2017}}</ref>


<ref name="Devogele-2017">{{Cite journal
<ref name="Devogele-2017">{{Cite journal|display-authors = 6
|display-authors = 6
|last1 = Devogè
|first1 = |last1 = Devogè
|first2 = M. |last2 = le
|first2 = M. |last2 = le
|first3 = P. |last3 = Tanga
|first3 = P. |last3 = Tanga
Line 301: Line 294:
|first51 = S. |last51 = Pastor
|first51 = S. |last51 = Pastor
|first52 = F. |last52 = Pilcher
|first52 = F. |last52 = Pilcher
|first53 = |last53 = Quiñ
|last53 = Quiñ
|first54 = M. C. |last54 = ones
|first54 = M. C. |last54 = ones
|first55 = P. |last55 = Trela
|first55 = P. |last55 = Trela
Line 307: Line 300:
|date = July 2017
|date = July 2017
|title = Shape and spin determination of Barbarian asteroids
|title = Shape and spin determination of Barbarian asteroids
|url = https://arxiv.org/pdf/1707.07503.pdf
|journal = Astronomy & Astrophysics|volume = 607|issue = 119|pages = A119|arxiv = 1707.07503
|doi = 10.1051/0004-6361/201630104|bibcode = 2017A&A...607A.119D}}</ref>
|journal = eprint arXiv:1707.07503
|bibcode = 2017arXiv170707503D
|arxiv = 1707.07503
|access-date= 18 November 2017}}</ref>


<ref name="Veres-2015">{{cite journal
<ref name="Veres-2015">{{cite journal
Line 345: Line 335:
}} <!-- end of reflist -->
}} <!-- end of reflist -->



== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [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://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{JPL small body}}


{{Minor planets navigator |2084 Okayama |number=2085 |2086 Newell}}
{{Minor planets navigator |2084 Okayama |number=2085 |2086 Newell}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}
{{Authority control}}


{{DEFAULTSORT:Henan}}
{{DEFAULTSORT:Henan}}
[[Category:Henan asteroids|002085]]
[[Category:Henan asteroids|002085]]
[[Category:Numbered minor planets|002085]]
[[Category:Discoveries by the Purple Mountain Observatory|002085]]
[[Category:Discoveries by the Purple Mountain Observatory|002085]]
[[Category:Minor planets named for places]]
[[Category:Named minor planets]]
[[Category:Named minor planets]]
[[Category:L-type asteroids (SMASS)|002085]]
[[Category:L-type asteroids (SMASS)|002085]]

Latest revision as of 18:27, 9 September 2024

2085 Henan
Discovery [1]
Discovered byPurple Mountain Obs.
Discovery sitePurple Mountain Obs.
Discovery date20 December 1965
Designations
(2085) Henan
Named after
Henan (Province of China)[2]
1965 YA · 1933 RE
1938 WR · 1949 FL
1949 FP1 · 1962 CL
1963 KA · 1969 VA1
1971 BG1 · 1972 LX
1973 QX1 · 1976 GR7
main-belt · (outer)
Henan [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc68.61 yr (25,060 days)
Aphelion2.9312 AU
Perihelion2.4654 AU
2.6983 AU
Eccentricity0.0863
4.43 yr (1,619 days)
276.34°
0° 13m 20.64s / day
Inclination3.8343°
118.14°
294.54°
Physical characteristics
Dimensions13.356±0.036 km[4]
13.67 km (calculated)[5]
13.941±0.082 km[6]
16.56±4.50 km[7]
17.61±0.32 km[8]
18 km[9]: 23 
18.34±1.20 km[10]
24 h[11]
110±1 h[12]
0.10±0.08[7]
0.131±0.019[8]
0.145±0.020[10]
0.18 (assumed)[5]
0.2510±0.0408[6]
SMASS = L [1][5]
L (Bus–DeMeo)[12]
11.40[6][10] · 11.55±0.48[13] · 11.60[8] · 11.8[5] · 11.9[1] · 12.12[7]

2085 Henan, provisional designation 1965 YA, is a potentially slow rotating asteroid and the parent body of the Henan family in the central regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 20 December 1965, by astronomers at the Purple Mountain Observatory in Nanking, China.[14] The asteroid was named for the Henan Province in China.[2]

Orbit and classification

[edit]

Henan is the parent body of the Henan family (532),[3] a large family of L-type asteroids in the intermediate main-belt, which can be further divided into four distinct families.[9]: 23 

It orbits the Sun in the central asteroid belt at a distance of 2.5–2.9 AU once every 4 years and 5 months (1,619 days; semi-major axis of 2.70 AU). Its orbit has an eccentricity of 0.09 and an inclination of 4° with respect to the ecliptic.[1]

A first observation of this asteroid was found on a precovery, taken at the Lowell Observatory in July 1906. The body's observation arc begins at Goethe Link Observatory in July 1943, more than 22 years prior to its official discovery observation at Purple Mountain.[14]

Physical characteristics

[edit]

In the Bus–DeMeo and SMASS classification, Henan is an uncommon L-type asteroid,[1][5][12]: 5  which is also the overall spectral type for members of the Henan family.[9]: 23 

Rotation period

[edit]

As of 2017, no secure rotational lightcurve of Henan has been obtained. In September 2004, observations by Laurent Bernasconi gave a rotation period of 24 hours with a brightness variation of 0.25 magnitude (U=1).[11] In February 2015, photometric observations of Henan by an international collaboration of astronomers gave a tentative synodic period of 110±1 hours and an amplitude of 0.4 magnitude, which would make it a potentially slow rotator (U=1).[12] An alternative period solution gave 94 hours. The latter study selected Henan because it is a suspected "Barbarian" asteroid (named after 234 Barbara) which polarimetric properties suggest that they have an unusual shape and topographic features with large concave areas.[12]

Diameter and albedo

[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Henan measures between 13.356 and 18.34 kilometers in diameter and its surface has an albedo between 0.10 and 0.2510.[4][6][7][8][10]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and calculates a diameter of 13.67 kilometers based on an absolute magnitude of 11.8.[5]

Naming

[edit]

This minor planet was named after the Henan Province in the People's Republic of China, located in the central part of the country along the lower stretch of the Yellow River, which is considered the cradle of civilization in ancient China.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5184).[15]

References

[edit]
  1. ^ a b c d e f "JPL Small-Body Database Browser: 2085 Henan (1965 YA)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 18 November 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2085) Henan". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 169. doi:10.1007/978-3-540-29925-7_2086. ISBN 978-3-540-00238-3.
  3. ^ a b "Asteroid 2085 Henan – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
  4. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  5. ^ a b c d e f "LCDB Data for (2085) Henan". Asteroid Lightcurve Database (LCDB). Retrieved 18 November 2017.
  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 c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
  8. ^ 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 18 November 2017.
  9. ^ a b c Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
  10. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2085) Henan". Geneva Observatory. Retrieved 18 November 2017.
  12. ^ a b c d e Devogè; le, M.; Tanga, P.; Bendjoya, P.; Rivet, J. P.; Surdej, J.; et al. (July 2017). "Shape and spin determination of Barbarian asteroids". Astronomy & Astrophysics. 607 (119): A119. arXiv:1707.07503. Bibcode:2017A&A...607A.119D. doi:10.1051/0004-6361/201630104.
  13. ^ 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 18 November 2017.
  14. ^ a b "2085 Henan (1965 YA)". Minor Planet Center. Retrieved 18 November 2017.
  15. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 November 2017.


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