_Margo.png) Modelled shape ofMargo from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 17 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 arc | 109.91 yr (40,146 days) |
| Aphelion | 3.4345AU |
| Perihelion | 2.9979 AU |
| 3.2162 AU | |
| Eccentricity | 0.0679 |
| 5.77yr (2,107 days) | |
| 61.257° | |
| 0° 10m 15.24s / day | |
| Inclination | 16.307° |
| 237.19° | |
| 102.79° | |
| Physical characteristics | |
| Dimensions | 22.99±0.85 km[5] 24.266±0.276 km[6] 25.394±0.250 km[7] 58.29 km(calculated)[3] |
| 6.01±0.02h[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] | |
1175 Margo, provisional designation1930 UD, is a stonybackground asteroid from the outermost regions of theasteroid belt, approximately 24 kilometers in diameter. It was discovered on 17 October 1930, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[15] Themeaning of the asteroids's name is unknown.[2]
Margo is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theoutermost 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 aneccentricity of 0.07 and aninclination of 16° with respect to theecliptic.[1]
The body'sobservation arc begins with its first identification asA907 VA at Heidelberg in November 1907, almost 23 years prior to its official discovery observation.[15]
Margo has been characterized as a stonyS-type asteroid byPan-STARRS photometric survey.[14] Conversely, theCollaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceousC-type.[3]
In November 2005, a rotationallightcurve ofMargo was obtained from photometric observations by astronomers Raymond Poncy (177), Gino Farroni,Pierre Antonini, Donn Starkey (H63) andRaoul Behrend. Lightcurve analysis gave a well-definedrotation period of 6.0136 hours with a brightness amplitude of 0.31magnitude (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 twospin axis inecliptic coordinates of (184.0°, −43.0°) and (353.0°, −17.0°).[10]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Margo measures between 22.99 and 25.394 kilometers in diameter and its surface has analbedo 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 anabsolute magnitude of 9.9.[3]
Thisminor planet was named by the discovererKarl Reinmuth. Any reference of its name to a person or occurrence is unknown.[2]
Among the many thousands ofnamed 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 between164 Eva and1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomersAuguste Charlois,Johann Palisa,Max Wolf andKarl Reinmuth.[16]
