2862 Vavilov

2862 Vavilov, provisional designation 1977 JP, is a stony background asteroid and exceptionally slow rotator from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 15 May 1977, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[11] The asteroid was named after Russian plant geneticist Nikolai Vavilov and his physicist brother Sergey Ivanovich Vavilov.[2]

2862 Vavilov
Discovery [1]
Discovered byN. Chernykh
Discovery siteCrimean Astrophysical Obs.
Discovery date15 May 1977
Designations
(2862) Vavilov
Named after
Nikolai Vavilov and
Sergey Ivanovich Vavilov
(Russian scientists)[2]
1977 JP · 1931 DY
1972 VF1 · 1978 SV2
main-belt · (inner)
Flora [3] · background [4][5]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.60 yr (31,631 days)
Aphelion2.4532 AU
Perihelion1.9490 AU
2.2011 AU
Eccentricity0.1145
3.27 yr (1,193 days)
194.09°
0° 18m 6.48s / day
Inclination3.4849°
225.83°
278.04°
Physical characteristics
Dimensions6.031±0.681 km[6][7]
6.44±0.57 km[8]
7.82 km (calculated)[3]
7.95±1.41 km[9]
800 h[lower-alpha 1]
0.21±0.12[9]
0.24 (assumed)[3]
0.323±0.059[8]
0.4039±0.0762[7]
0.404±0.076[6]
S (assumed)[3]
12.7[3][7] · 12.78±0.66[10] · 12.80[1][8] · 13.11[9]

    Orbit and classification

    Vavilov is located in the dynamical region of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[3] However, it is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5]

    It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,193 days). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic.[1]

    The body's observation arc begins with its first identification as 1931 DY at Lowell Observatory in February 1931, more than 46 years prior to its official discovery observation at Nauchnij.[11]

    Physical characteristics

    Vavilov is an assumed stony S-type asteroid,[3] which is also the overall spectral type for members of the Flora family.

    Rotation period

    In February 2006, a rotational lightcurve of Vavilov was obtained from photometric observations by Petr Pravec at Ondřejov Observatory in the Czech Republic. Lightcurve analysis gave a rotation period of 800 hours with a brightness amplitude of at least 0.4 magnitude (U=2)[lower-alpha 1]

    With a period above 500 hours, Vavilov is one of only a few dozen slow rotators with such an extreme spin rate currently known to exists.

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Vavilov measures between 6.031 and 7.95 kilometers in diameter and its surface has an albedo between 0.21 and 0.404.[6][7][8][9]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the Flora family's parent body – and calculates a diameter of 7.82 kilometers based on an absolute magnitude of 12.7.[3]

    Naming

    This minor planet was named in memory of Russian plant geneticist Nikolai Vavilov (1887–1943) and his physicist brother Sergey Ivanovich Vavilov (1891-1951).[2] The official naming citation was published by the Minor Planet Center on 18 September 1986 (M.P.C. 11157).[12] The lunar crater Vavilov was also named in their honor.[2]

    Notes
    1. Pravec (2006) web: lightcurve plot for (2862) Vavilov with rotation period 800 hours and a brightness amplitude of 0.4 mag. Quality code of 2. Observer's comment: "The apparently continuous decrease over the 8-day interval suggests a period on an order of 800 hours or longer; A>=0.4 mag." Summary figures at LCDB and at Ondrejov Asteroid Photometry Project, see (data sheet)

    References
    1. "JPL Small-Body Database Browser: 2862 Vavilov (1977 JP)" (2017-09-30 last obs.). Jet Propulsion Laboratory. Retrieved 21 October 2017.
    2. Schmadel, Lutz D. (2007). "(2862) Vavilov". Dictionary of Minor Planet Names – (2862) Vavilov. Springer Berlin Heidelberg. p. 235. doi:10.1007/978-3-540-29925-7_2863. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2862) Vavilov". Asteroid Lightcurve Database (LCDB). Retrieved 21 October 2017.
    4. "Asteroid 2862 Vavilov – Asteroid Dynamical Families V4.1". Small Bodies Data Ferret. Retrieved 29 October 2019.
    5. "Asteroid 2862 Vavilov – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    6. 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 21 October 2017.
    7. 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.
    8. 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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    9. 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. Retrieved 21 October 2017.
    10. 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 21 October 2017.
    11. "2862 Vavilov (1977 JP)". Minor Planet Center. Retrieved 21 October 2017.
    12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 October 2017.

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