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.[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. (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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    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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