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1103 Sequoia

From Wikipedia, the free encyclopedia
Asteroid

1103 Sequoia
Shape model ofSequoia from itslightcurve
Discovery[1]
Discovered byW. Baade
Discovery siteBergedorf Obs.
Discovery date9 November 1928
Designations
(1103) Sequoia
Pronunciation/sɪˈkwɔɪ.ə/[2]
Named after
Sequoia National Park[3]
(national park, California)
1928 VB
main-belt · (inner[1]
Hungaria[4][5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc88.91 yr (32,473 days)
Aphelion2.1169AU
Perihelion1.7505 AU
1.9337 AU
Eccentricity0.0948
2.69yr (982 days)
66.943°
0° 21m 59.4s / day
Inclination17.899°
267.65°
77.910°
Physical characteristics
Dimensions5.21±0.42 km[6]
6.692±0.078 km[7]
7.623±0.058 km[8]
7.816 km[9]
7.82 km(taken)[4]
3.0335±0.0003h[10]
3.037±0.002 h[11]
3.03784±0.00001 h[10]
3.03797 h[a]
3.037976±0.00005 h[12]
3.037977±0.000005 h[13]
3.0381±0.0002 h[14]
3.04±0.01 h[15]
3.044±0.005 h[16][b]
3.049±0.001 h[17]
3.049±0.002 h[18]
0.2813[9]
0.3044±0.0439[8]
0.384±0.059[7]
0.823±0.138[6]
Tholen =E[1] · E[8]
SMASS = Xk[1][4] ·
B–V = 0.731[1]
U–B = 0.242[1]
12.25[1][6] · 12.53[4][8] · 12.53±0.08[9][18]

1103 Sequoia (/səˈkwɔɪ.ə/;prov. designation:1928 VB) is a brightHungaria asteroid from the innermost region of theasteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 9 November 1928, by German astronomerWalter Baade at theBergedorf Observatory in Hamburg, Germany, who named it after theSequoia National Park located in California.[19]

Orbit and classification

[edit]

Sequoia is a bright member of theHungaria family (003),[5] a largefamily within the larger dynamicalHungaria group that forms theinnermost dense concentration of asteroids in theSolar System.[4][20]: 23  It orbits the Sun at a distance of 1.8–2.1 AU once every 2 years and 8 months (982 days;semi-major axis of 1.93 AU). Its orbit has aneccentricity of 0.09 and aninclination of 18° with respect to theecliptic.[1]

The body'sobservation arc begins at the North AfricanAlgiers Observatory in December 1928, about 7 weeks after its official discovery observation at Bergedorf.[19]

Physical characteristics

[edit]

In theTholen classification and based on observations by theWide-field Infrared Survey Explorer (WISE),Sequoia is a brightE-type asteroid,[1][8] which is the predominant type for members of the Hungaria family,[20]: 23  while in theSMASS classification, it is a Xk-subtype that transitions between theX- andK-type asteroids.[1][4]

Rotation period

[edit]

A large number of rotationallightcurves[b] ofSequoia have been obtained from photometric observations since 1990.[10][11][14][15][16][17][18] Best rated lightcurve by Italian amateur astronomerSilvano Casulli from December 2006 gave arotation period of 3.03784 hours with a brightness amplitude of 0.44magnitude (U=3).[4][10]

Poles

[edit]

Sequoia's lightcurve has also been modeled several times and gave a concurring sidereal period of 3.03797, 3.037976 and 3.037977 hours.[12][13][a] In 2016, the large collaboration of astronomers also published aspin axis of (60.0°, −59.0°) inecliptic coordinates (λ, β).[12]

Diameter and albedo

[edit]

According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA's WISE telescope,Sequoia measures between 5.21 and 7.816 kilometers in diameter and its surface has analbedo between 0.2813 and 0.823.[6][7][8][9]

TheCollaborative Asteroid Lightcurve Link adoptsPetr Pravec's revised WISE results, that is, an albedo of 0.2813 and a diameter of 7.82 kilometers based on anabsolute magnitude of 12.53.[4][9]

Naming

[edit]

Thisminor planet was named after theSequoia National Park located in California, United States, where the discoverer spent his vacations. The park is famous for itsgiant sequoia trees. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H n.a.).[3]

Notes

[edit]
  1. ^abDurech (2006).(1103) Sequoia: sidereal rotation period of3.037975 hours (Quality code of 2). Two spin axes at (82.0, -75.0) and (209.0, -76.0) in ecliptic coordinates. Summary figures at theLCDB
  2. ^abLightcurve plot of 1103 Sequoia, Palmer Divide Observatory,B. D. Warner (2011). Summary figures at theLCDB

References

[edit]
  1. ^abcdefghijk"JPL Small-Body Database Browser: 1103 Sequoia (1928 VB)" (2017-11-26 last obs.).Jet Propulsion Laboratory. Retrieved10 January 2018.
  2. ^"Sequoia".Merriam-Webster.com Dictionary. Merriam-Webster.
  3. ^abSchmadel, Lutz D. (2007). "(1103) Sequoia".Dictionary of Minor Planet Names.Springer Berlin Heidelberg. p. 94.doi:10.1007/978-3-540-29925-7_1104.ISBN 978-3-540-00238-3.
  4. ^abcdefgh"LCDB Data for (1103) Sequoia". Asteroid Lightcurve Database (LCDB). Retrieved10 January 2018.
  5. ^ab"Asteroid 1103 Sequoia – Nesvorny HCM Asteroid Families V3.0".Small Bodies Data Ferret. Retrieved26 October 2019.
  6. ^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)
  7. ^abcMasiero, 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.
  8. ^abcdefMainzer, 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.
  9. ^abcdePravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012)."Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations".Icarus.221 (1):365–387.Bibcode:2012Icar..221..365P.doi:10.1016/j.icarus.2012.07.026. Retrieved10 January 2018.
  10. ^abcdBehrend, Raoul."Asteroids and comets rotation curves".Geneva Observatory. Retrieved10 January 2018.
  11. ^abWarner, Brian D. (January 2015)."Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June-October"(PDF).Minor Planet Bulletin.42 (1):54–60.Bibcode:2015MPBu...42...54W.ISSN 1052-8091.
  12. ^abcHanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network".Astronomy and Astrophysics.586: 24.arXiv:1510.07422.Bibcode:2016A&A...586A.108H.doi:10.1051/0004-6361/201527441.
  13. ^abHanuš, J.; Ďurech, J.; Brož, 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 and Astrophysics.530: A134.arXiv:1104.4114.Bibcode:2011A&A...530A.134H.doi:10.1051/0004-6361/201116738.ISSN 0004-6361.
  14. ^abWarner, Brian D. (April 2015)."Two New Binaries and Continuing Observations of Hungaria Group Asteroids"(PDF).Minor Planet Bulletin.42 (2):132–136.Bibcode:2015MPBu...42..132W.ISSN 1052-8091.
  15. ^abLecrone, Crystal; Duncan, Allison; Kirkpatrick, Elaine (December 2004)."Lightcurves and periods for asteroids 105 Artemis, 978 Aidamina, and 1103 Sequoia"(PDF).Minor Planet Bulletin.31 (4):77–78.Bibcode:2004MPBu...31...77L.ISSN 1052-8091.
  16. ^abWarner, Brian D. (January 2012)."Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2011 June - September"(PDF).Minor Planet Bulletin.39 (1):16–21.Bibcode:2012MPBu...39...16W.ISSN 1052-8091. Archived fromthe original(PDF) on 22 February 2020. Retrieved13 March 2020.
  17. ^abShevchenko, V. G.; Krugly, Yu. N.; Chiorny, V. G.; Belskaya, I. N.; Gaftonyuk, N. M. (August 2003)."Rotation and photometric properties of E-type asteroids".Planetary and Space Science.51 (9–10):525–532.Bibcode:2003P&SS...51..525S.doi:10.1016/S0032-0633(03)00076-X. Retrieved10 January 2018.
  18. ^abcWisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995)."Photoelectric Observations of 125 Asteroids".Abstracts of the Lunar and Planetary Science Conference.26: 1511.Bibcode:1995LPI....26.1511W. Retrieved10 January 2018.
  19. ^ab"1103 Sequoia (1928 VB)".Minor Planet Center. Retrieved10 January 2018.
  20. ^abNesvorný, 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.

External links

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