1162 Larissa
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 5 January 1930 |
| Designations | |
| (1162) Larissa | |
| Pronunciation | /ləˈrɪsə/[2] |
Named after | Larissa(Greek city)[3] |
| 1930 AC·1948 KJ | |
| main-belt·(outer)[1] Hilda[4][5] | |
| Orbital characteristics[1] | |
| Epoch4 September 2017 (JD2458000.5) | |
| Uncertainty parameter0 | |
| Observation arc | 87.50 yr (31,958 days) |
| Aphelion | 4.3705AU |
| Perihelion | 3.5082 AU |
| 3.9393 AU | |
| Eccentricity | 0.1095 |
| 7.82yr(2,856 days) | |
| 315.27° | |
| 0° 7m33.96s/ day | |
| Inclination | 1.8856° |
| 39.808° | |
| 209.55° | |
| JupiterMOID | 0.6683 AU |
| Physical characteristics | |
| Dimensions | 41.3±0.9km[6] 42.243±0.111km[6] 44.32 km(derived)[4] 48.59±1.50km[7] |
| 6.514±0.003h[8][a] 6.516±0.002h[9] 6.520±0.0021h[10] 13.0h(dated)[11] | |
| 0.1153(derived)[4] 0.127±0.009[7] 0.169±0.012[6] 0.18±0.03[6] | |
| Tholen= P[1][4]·M[6] B–V= 0.761[1] U–B= 0.226[1] | |
| 9.314±0.001(R)[10]·9.40[6]·9.42±0.43[12]·9.44[1][7]·9.73[4][13] | |
1162 Larissa,provisional designation1930 AC,is a metallic Hildianasteroidfrom the outermost regions of theasteroid belt,approximately 43 kilometers in diameter. It was discovered on 5 January 1930, by astronomer German astronomerKarl ReinmuthatHeidelberg Observatoryin southwest Germany.[14]The asteroid was named after the Greek city ofLarissa.[3]
Orbit and classification
[edit]Larissabelongs to theHilda grouplocatedoutermostpart of the main-belt.[4]Asteroids in this dynamical group have semi-major axis between 3.7 and 4.2AUand stay in a 3:2resonancewith the gas giant Jupiter.Larissa,however, is abackground asteroidand not a member of the (collisional)Hilda family(101).[5]
The asteroid orbits the Sun at a distance of 3.5–4.4 AU once every 7 years and 10 months (2,856 days). Its orbit has aneccentricityof 0.11 and aninclinationof 2°with respect to theecliptic.[1]The body'sobservation arcbegins 15 days after its official discovery observation at Heidelberg.[14]
Physical characteristics
[edit]Larissahas been characterized as a metallicM-type asteroidby theWide-field Infrared Survey Explorer(WISE).[6]In theTholen classification,the asteroid a primitiveP-type asteroid,which typically have lower albedos than those measured by WISE and Akari(see below).[1]
Rotation period
[edit]In April 2017, a rotationallightcurveofLarissawas obtained from photometric observations by American astronomersBrian WarnerandRobert Stephensat the Center for Solar System Studies (U81/U82) in California. Lightcurve analysis gave a well-definedrotation periodof 6.514 hours with a brightness variation of 0.12magnitude(U=3).[8][a]
In May 2010, a lightcurve form the Oakley Southern Sky Observatory (E09) in Australia, gave a concurring period of 6.516 hours with an amplitude of 0.20 magnitude (U=3).[9]Another period of 6.520 hours (Δ0.12 mag) was measured at thePalomar Transient Factoryin October 2012 (U=2).[10]The first photometric observation ofLarissa,which gave a period of 13.0 hours, is now considered incorrect (U=1).[11]
Diameter and albedo
[edit]According to the surveys carried out by the JapaneseAkari satelliteand theNEOWISEmission of NASA's WISE telescope,Larissameasures between 41.3 and 48.59 kilometers in diameter and its surface has analbedobetween 0.127 and 0.18.[6][7]TheCollaborative Asteroid Lightcurve Linkderives an albedo of 0.1153 and a diameter of 44.32 kilometers based on anabsolute magnitudeof 9.73.[4]
Naming
[edit]Thisminor planetwas named for the city ofLarissa,capital of theThessaly regionin Greece, after which the asteroid1161 Thessaliawas named. The name was also given toLarissa(Neptune VII), one of themoons of Neptune.The official naming citation was mentioned inThe Names of the Minor PlanetsbyPaul Hergetin 1955 (H 108).[3]
Notes
[edit]- ^abLightcurve plot of (1162) Larissa,by Stephens and Warner (2017), Center for Solar System Studies (CS3)
References
[edit]- ^abcdefghi"JPL Small-Body Database Browser: 1162 Larissa (1930 AC)"(2017-07-05 last obs.).Jet Propulsion Laboratory.Retrieved7 September2017.
- ^Noah Webster (1884)A Practical Dictionary of the English Language
- ^abcSchmadel, Lutz D. (2007). "(1162) Larissa".Dictionary of Minor Planet Names.Springer Berlin Heidelberg.p. 98.doi:10.1007/978-3-540-29925-7_1163.ISBN978-3-540-00238-3.
- ^abcdefg"LCDB Data for (1162) Larissa".Asteroid Lightcurve Database (LCDB).Retrieved7 September2017.
- ^ab"Asteroid 1162 Larissa – Proper Elements".AstDyS-2, Asteroids – Dynamic Site.Retrieved28 October2019.
- ^abcdefghGrav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S.; et al. (January 2012)."WISE/NEOWISE Observations of the Hilda Population: Preliminary Results".The Astrophysical Journal.744(2): 15.arXiv:1110.0283.Bibcode:2012ApJ...744..197G.doi:10.1088/0004-637X/744/2/197.S2CID44000310.Retrieved7 September2017.
- ^abcdUsui, 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)
- ^abWarner, Brian D.; Stephens, Robert D. (July 2017)."Lightcurve Analysis of Hilda Asteroids at the Center for Solar System Studies: 2016 December thru 2017 April".The Minor Planet Bulletin.44(3): 220–222.Bibcode:2017MPBu...44..220W.ISSN1052-8091.PMC7243934.PMID32455402.Retrieved7 September2017.
- ^abPligge, Zachary; Monnier, Adam; Pharo, John; Stolze, Kellen; Yim, Arnold; Ditteon, Richard (January 2011)."Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2010 May".The Minor Planet Bulletin.38(1): 5–7.Bibcode:2011MPBu...38....5P.ISSN1052-8091.Retrieved7 September2017.
- ^abcWaszczak, 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.S2CID8342929.Retrieved7 September2017.
- ^abDahlgren, M.; Lahulla, J. F.; Lagerkvist, C.-I.; Lagerros, J.; Mottola, S.; Erikson, A.; et al. (June 1998)."A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids".Icarus.133(2): 247–285.Bibcode:1998Icar..133..247D.doi:10.1006/icar.1998.5919.Retrieved7 September2017.
- ^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.S2CID53493339.Retrieved7 September2017.
- ^Binzel, Richard P.; Sauter, Linda M. (February 1992)."Trojan, Hilda, and Cybele asteroids - New lightcurve observations and analysis".Icarus.95(2): 222–238.Bibcode:1992Icar...95..222B.doi:10.1016/0019-1035(92)90039-A.ISSN0019-1035.Retrieved7 September2017.
- ^ab"1162 Larissa (1930 AC)".Minor Planet Center.Retrieved7 September2017.
External links
[edit]- Asteroid Lightcurve Database (LCDB),query form (infoArchived16 December 2017 at theWayback Machine)
- Dictionary of Minor Planet Names,Google books
- Asteroids and comets rotation curves, CdR– Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000)– Minor Planet Center
- 1162 LarissaatAstDyS-2, Asteroids—Dynamic Site
- 1162 Larissaat theJPL Small-Body Database
