1175 Margo

1175 Margo, provisional designation 1930 UD, is a stony background asteroid from the outermost regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 17 October 1930, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[15] The meaning of the asteroids's name is unknown.[2]

1175 Margo
Modelled shape of Margo from its lightcurve
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date17 October 1930
Designations
(1175) Margo
Named after
unknown[2]
1930 UD · 1953 VK
1957 KU · A907 VA
main-belt · (outer) [1][3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc109.91 yr (40,146 days)
Aphelion3.4345 AU
Perihelion2.9979 AU
3.2162 AU
Eccentricity0.0679
5.77 yr (2,107 days)
61.257°
0° 10m 15.24s / day
Inclination16.307°
237.19°
102.79°
Physical characteristics
Dimensions22.99±0.85 km[5]
24.266±0.276 km[6]
25.394±0.250 km[7]
58.29 km (calculated)[3]
6.01±0.02 h[8]
6.01±0.03 h[9]
6.0136±0.0002 h[9]
6.01375±0.00005 h[10]
6.015±0.001 h[11]
6.017±0.001 h[12]
11.99±0.03 h[13]
0.057 (assumed)[3]
0.2409±0.0329[7]
0.249±0.042[6]
0.302±0.026[5]
S [14] · C (assumed)[3]
9.9[3] · 10.0[1] · 10.06±0.23[14] · 10.20[5][7]

    Orbit and classification

    Margo is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outermost asteroid belt at a distance of 3.0–3.4 AU once every 5 years and 9 months (2,107 days; semi-major axis of 3.22 AU). Its orbit has an eccentricity of 0.07 and an inclination of 16° with respect to the ecliptic.[1]

    The body's observation arc begins with its first identification as A907 VA at Heidelberg in November 1907, almost 23 years prior to its official discovery observation.[15]

    Physical characteristics

    Margo has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey.[14] Conversely, the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type.[3]

    Rotation period and poles

    In November 2005, a rotational lightcurve of Margo was obtained from photometric observations by astronomers Raymond Poncy (177), Gino Farroni, Pierre Antonini, Donn Starkey (H63) and Raoul Behrend. Lightcurve analysis gave a well-defined rotation period of 6.0136 hours with a brightness amplitude of 0.31 magnitude (U=3).[9] Since then, several other, lower-rated lightcurves have been published (U=3-/2+/2+/2/2).[8][9][11][12][13]

    In 2016, the asteroid lightcurve has also been modeled using photometric data from various sources. It gave a concurring period of 6.01375 hours and two spin axis in ecliptic coordinates of (184.0°, −43.0°) and (353.0°, −17.0°).[10]

    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, Margo measures between 22.99 and 25.394 kilometers in diameter and its surface has an albedo between 0.2409 and 0.302.[5][6][7] CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 58.29 kilometers based on an absolute magnitude of 9.9.[3]

    Naming

    This minor planet was named by the discoverer Karl Reinmuth. Any reference of its name to a person or occurrence is unknown.[2]

    Unknown meaning

    Among the many thousands of named minor planets, Margo is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth (also see category).[16]

    References
    1. "JPL Small-Body Database Browser: 1175 Margo (1930 UD)" (2017-11-02 last obs.). Jet Propulsion Laboratory. Retrieved 15 November 2017.
    2. Schmadel, Lutz D. (2007). "(1175) Margo". Dictionary of Minor Planet Names – (1175) Margo. Springer Berlin Heidelberg. p. 99. doi:10.1007/978-3-540-29925-7_1176. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1175) Margo". Asteroid Lightcurve Database (LCDB). Retrieved 15 November 2017.
    4. "Asteroid 1175 Margo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
    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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    6. Masiero, 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. Retrieved 15 November 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. Montgomery, Kent A.; Davis, Cheri; Renshaw, Thomas; Rolen, Jacob (October 2013). "Photometric Study of Four Asteroids at Texas A&M Commerce Observatory". The Minor Planet Bulletin. 40 (4): 212–213. Bibcode:2013MPBu...40..212M. ISSN 1052-8091. Retrieved 15 November 2017.
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (1175) Margo". Geneva Observatory. Retrieved 14 November 2017.
    10. Hanus, 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.
    11. Brinsfield, James W. (January 2010). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2009 3rd Quarter". The Minor Planet Bulletin. 37 (1): 19–20. Bibcode:2010MPBu...37...19B. ISSN 1052-8091. Retrieved 15 November 2017.
    12. Klinglesmith, Daniel A., III; Hanowell, Jesse; Warren, Curtis Alan (October 2014). "Lightcurves for Inversion Model Candidates". The Minor Planet Bulletin. 41 (4): 206–208. Bibcode:2014MPBu...41..206K. ISSN 1052-8091. Retrieved 15 November 2017.
    13. Oliver, Robert Lemke; Shipley, Heath; Ditteon, Richard (October 2008). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2008 March". The Minor Planet Bulletin. 35 (4): 149–150. Bibcode:2008MPBu...35..149O. ISSN 1052-8091. Retrieved 15 November 2017.
    14. 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 15 November 2017.
    15. "1175 Margo (1930 UD)". Minor Planet Center. Retrieved 15 November 2017.
    16. Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN 978-3-540-00238-3.

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