985 Rosina

985 Rosina, provisional designation 1922 MO, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 14 October 1922, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany.[3] The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.[2]

985 Rosina
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date14 October 1922
Designations
(985) Rosina
Named after
A girl's name picked from a
popular German calendar [2]
1922 MO
Mars crosser [1][3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc94.37 yr (34,467 days)
Aphelion2.9380 AU
Perihelion1.6604 AU
2.2992 AU
Eccentricity0.2778
3.49 yr (1,273 days)
92.838°
0° 16m 57.72s / day
Inclination4.0564°
290.33°
59.636°
Earth MOID0.6583 AU · 256.5 LD
Physical characteristics
Dimensions8.18 km (calculated)[4]
3.012±0.001 h[5]
3.0126±0.0002 h[6]
0.20 (assumed)[4]
SMASS = S [1][4] · S [7][8]
12.70[8] · 12.8[1][4] · 13.05±0.30[7]

    Orbit and classification

    Rosina is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU.[1][3]

    It orbits the Sun in the inner main-belt at a distance of 1.7–2.9 AU once every 3 years and 6 months (1,273 days). Its orbit has an eccentricity of 0.28 and an inclination of 4° with respect to the ecliptic.[1] The body's observation arc begins at Vienna Observatory, eight days after its official discovery observation at Heidelberg.[3]

    Physical characteristics

    In the SMASS classification, Rosina is a stony S-type asteroid.[1] It has also been characterized as such by Pan-STARRS and SDSS.[7][8]

    Rotation period

    Two rotational lightcurves of Rosina were obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 3.012 and 3.0126 hours with an identical brightness amplitude of 0.22 magnitude (U=3/3).[5][6]

    Diameter and albedo

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on an absolute magnitude of 12.8.[4]

    Naming

    This minor planet was named after a girl's name picked from the German popular calendar Der Lahrer hinkende Bote.(de)

    Reinmuth's Calendar Girls

    As with 913 Otila, 997 Priska and 1144 Oda, Reinmuth selected names from this calendar due to his many asteroid discoveries that he had trouble thinking of proper names. These names are not related to the discoverer's contemporaries. The author of the Dictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomer Ingrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg.[2]

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    References
    1. "JPL Small-Body Database Browser: 985 Rosina (1922 MO)" (2017-02-24 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
    2. Schmadel, Lutz D. (2007). "(985) Rosina". Dictionary of Minor Planet Names – (985) Rosina. Springer Berlin Heidelberg. p. 86. doi:10.1007/978-3-540-29925-7_986. ISBN 978-3-540-00238-3.
    3. "985 Rosina (1922 MO)". Minor Planet Center. Retrieved 2 November 2017.
    4. "LCDB Data for (985) Rosina". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
    5. Martinez, Jaume; Aymami, Josep Maria; Bosque, Ramon; Martin, Joan (April 2010). "CCD Photometry and Lightcurve Analysis of 985 Rosina and 990 Yerkes from Grup D'Astronomica de Tiana (G.A.T.) Observatory". The Minor Planet Bulletin. 37 (2): 42–43. Bibcode:2010MPBu...37...42M. ISSN 1052-8091. Retrieved 2 November 2017.
    6. Behrend, Raoul. "Asteroids and comets rotation curves – (985) Rosina". Geneva Observatory. Retrieved 2 November 2017.
    7. 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 2 November 2017.
    8. Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 2 November 2017.

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