1376 Michelle

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1376 Michelle
Discovery [1]
Discovered by G. Reiss
Discovery site Algiers Obs.
Discovery date29 October 1935
Designations
(1376) Michelle
Named after
Michelle Reiss
(discoverer's daughter) [2]
1935 UH ·1931 JK
main-belt  · Flora [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 81.02 yr (29,594 days)
Aphelion 2.7085 AU
Perihelion 1.7478 AU
2.2282 AU
Eccentricity 0.2156
3.33 yr (1,215 days)
216.89°
0° 17m 46.68s / day
Inclination 3.5516°
163.47°
156.05°
Physical characteristics
Dimensions7.053±0.119 km [4] [5]
7.10 km (taken) [3]
7.104 km [6]
9.12±2.51 km [7]
5.9748±0.0002 h [8]
5.9766±0.0004 h [9]
5.9769±0.0005 h [10]
6.0±0.5 h [11]
0.263 [3] [6]
0.267±0.058 [4] [5]
0.28±0.17 [7]
S [3]
12.4 [1] [7]  ·12.81 [3] [4]  ·12.81±0.04 [6] [11]

    1376 Michelle, provisional designation 1935 UH, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 29 October 1935, by French astronomer Guy Reiss at the North African Algiers Observatory in Algeria. [12] It is named for the discoverer's daughter, Michelle Reiss. [2]

    Contents

    Classification and orbit

    Michelle is a member of the Flora family, one of the largest populations of stony S-type asteroids in the entire main-belt. It orbits the Sun at a distance of 1.7–2.7  AU once every 3 years and 4 months (1,215 days). Its orbit has an eccentricity of 0.22 and an inclination of 4° with respect to the ecliptic. [1] Michelle was first identified as 1931 JK at Lowell Observatory in 1931. The body's observation arc, however, begins with its official discovery observation at Algiers. [12]

    Lightcurve

    In October 2008, a group of French and Japanese astronomers obtained two rotational light-curves of Michelle from photometric observations. Light-curve analysis gave a well defined rotation period of 5.9748 and 5.9766 hours with a brightness variation of 0.20 and 0.13 magnitude, respectively ( U=3/3 ). [8] [9] The results concur with a period of 5.9769 hours obtained by a group of Polish astronomers in April 2004 ( U=2 ), [10] and with a period of 6.0 hours measured by JPL-photometrist Wiesław Wiśniewski in the 1980s ( U=2+ ). [11]

    Diameter and albedo

    According to the 2015-published results by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Michelle measures 9.12 kilometers in diameter and its surface has an albedo of 0.28, [7] while preliminary results gave a diameter of 7.1 kilometers and an albedo of 0.267. [4] [5] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.263 and a diameter of 7.10 kilometers, taken from Petr Pravec's 2012-revised WISE results. [3] [6]

    Naming

    This minor planet was named for Michelle Reiss, the third daughter of the discoverer. [2] The discoverer also named 1237 Geneviève and 1300 Marcelle after his other two daughters. Naming was first cited in The Names of the Minor Planets by Paul Herget in 1955 ( H 125 ). [2]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1376 Michelle (1935 UH)" (2016-11-06 last obs.). Jet Propulsion Laboratory . Retrieved 11 January 2017.
    2. 1 2 3 4 Schmadel, Lutz D. (2007). "(1376) Michelle". Dictionary of Minor Planet Names – (1376) Michelle. Springer Berlin Heidelberg. p. 111. doi:10.1007/978-3-540-29925-7_1377. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (1376) Michelle". Asteroid Lightcurve Database (LCDB). Retrieved 11 January 2017.
    4. 1 2 3 4 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.
    5. 1 2 3 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 11 January 2017.
    6. 1 2 3 4 Pravec, 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 . Retrieved 11 January 2017.
    7. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: 1509.02522 . Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117 . Retrieved 11 January 2017.
    8. 1 2 Hamanowa, Hiromi; Hamanowa, Hiroko (July 2009). "Lightcurves of 494 Virtus, 556 Phyllis, 624 Hektor 657 Gunlod, 111 Reinmuthia, 1188 Gothlandia, and 1376 Michelle". The Minor Planet Bulletin. 36 (3): 87–88. Bibcode:2009MPBu...36...87H. ISSN   1052-8091 . Retrieved 11 January 2017.
    9. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1376) Michelle". Geneva Observatory . Retrieved 11 January 2017.
    10. 1 2 Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; Ivanova, V.; Apostolovska, G.; et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy and Astrophysics. 546: 51. Bibcode:2012A&A...546A..72K. doi: 10.1051/0004-6361/201219199 . Retrieved 11 January 2017.
    11. 1 2 3 Wisniewski, 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 . Retrieved 11 January 2017.
    12. 1 2 "1376 Michelle (1935 UH)". Minor Planet Center. Retrieved 11 January 2017.
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