1190 Pelagia

1190 Pelagia, provisional designation 1930 SL, is a dark Nysian asteroid from the inner regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 20 September 1930, by Soviet–Georgian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[9] The asteroid was named after astronomer Pelageya Shajn.[2]

1190 Pelagia
Discovery[1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date20 September 1930
Designations
(1190) Pelagia
Named after
Pelageya Shajn
(Soviet–Russian astronomer)[2]
1930 SL · 1928 DP
1938 YA · 1953 VB
1953 XP · A909 BC
main-belt · (inner)
Nysa[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc108.44 yr (39,609 days)
Aphelion2.7530 AU
Perihelion2.1096 AU
2.4313 AU
Eccentricity0.1323
3.79 yr (1,385 days)
284.95°
0° 15m 36s / day
Inclination3.1697°
26.477°
41.199°
Physical characteristics
Dimensions15.05±3.86 km[4]
17.30±0.27 km[5]
17.39 km (derived)[3]
17.923±0.185 km[6]
2.3661±0.0003 h[7]
0.031±0.042[6]
0.0486 (derived)[3]
0.054±0.018[4]
0.067±0.002[5]
X[8] · C[3]
12.40[5] · 12.60[4] · 12.7[1][3] · 12.78±0.23[8] · 13.13[6]

    Classification and orbit

    Pelagia is a member of the Nysa family (405),[3] a prominent family of the inner main-belt, named after 44 Nysa.

    It orbits the Sun at a distance of 2.1–2.8 AU once every 3 years and 9 months (1,385 days). Its orbit has an eccentricity of 0.13 and an inclination of 3° with respect to the ecliptic.[1] The asteroid's observation arc begins at Heidelberg Observatory in January 1909, when it was identified as A909 BC, more than 21 years prior to its official discovery observation at Simeiz.[9]

    Physical characteristics

    The asteroid has been characterized as an X-type asteroid by Pan-STARRS photometric survey.[8]

    Lightcurve

    In December 2010, a rotational lightcurve of Pelagia was obtained from photometric observations by Japanese astronomer couple Hiromi and Hiroko Hamanowa. Lightcurve analysis gave a well-defined rotation period of 2.3661 hours with a brightness amplitude of 0.08 magnitude (U=3).[7]

    While not being a fast rotator, the body has a notably short period for an asteroid of its size. Based on the lightcurve's low amplitude, it appears to have a rather spheroidal shape.

    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, Pelagia measures between 15.05 and 17.923 kilometers in diameter and its surface has an albedo between 0.031 and 0.067.[4][5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0486 and a diameter of 17.39 kilometers based on an absolute magnitude of 12.7.[3]

    Naming

    This minor planet was named in honor of Soviet–Russian astronomer Pelageya Shajn (1894–1956). In 1928, she discovered the asteroid 1112 Polonia and became the first female discoverer of minor planets (RI 895).[2] A second asteroid, 1648 Shajna, was also named in her and her husbands memory (Grigory Shajn).[10]

    References
    1. "JPL Small-Body Database Browser: 1190 Pelagia (1930 SL)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 16 August 2017.
    2. Schmadel, Lutz D. (2007). "(1190) Pelagia". Dictionary of Minor Planet Names – (1190) Pelagia. Springer Berlin Heidelberg. p. 100. doi:10.1007/978-3-540-29925-7_1191. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1190) Pelagia". Asteroid Lightcurve Database (LCDB). Retrieved 16 August 2017.
    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 16 August 2017.
    5. 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)
    6. 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 16 August 2017.
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (1190) Pelagia". Geneva Observatory. Retrieved 16 August 2017.
    8. 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 16 August 2017.
    9. "1190 Pelagia (1930 SL)". Minor Planet Center. Retrieved 16 August 2017.
    10. Schmadel, Lutz D. (2007). "(1648) Shajna". Dictionary of Minor Planet Names – (1648) Shajna. Springer Berlin Heidelberg. p. 131. doi:10.1007/978-3-540-29925-7_1649. ISBN 978-3-540-00238-3.

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