| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 28 January 1930 |
| Designations | |
| (1144) Oda | |
Named after | A girl's name picked from a popular Germancalendar[2] |
| 1930 BJ · 1959 CJ 1967 EV | |
| main-belt · (outer) Hilda[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.27 yr (31,875 days) |
| Aphelion | 4.1018AU |
| Perihelion | 3.3959 AU |
| 3.7489 AU | |
| Eccentricity | 0.0942 |
| 7.26yr (2,651 days) | |
| 131.28° | |
| 0° 8m 8.88s / day | |
| Inclination | 9.7423° |
| 156.73° | |
| 220.87° | |
| Physical characteristics | |
| Dimensions | 56.347±0.194 km[4] 57.59±2.2 km[5] 57.65 km(derived)[3] 64.21±0.96 km[6] |
| 14.4h(dated)[7] 44.023±0.2530 h[8] | |
| 0.043±0.001[6] 0.0533±0.004[5] 0.0583(derived)[3] 0.061±0.014[4] | |
| Tholen =D[1][3] · X[9] B–V = 0.706[1] U–B = 0.249[1] | |
| 9.794±0.002(R)[8] · 9.9[3] · 10.00[1][5][6] · 10.05±0.54[9] | |
1144 Oda, provisional designation1930 BJ, is a dark Hildianasteroid from the outermost regions of theasteroid belt, approximately 57 kilometers in diameter. It was discovered on 28 January 1930, by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory.[10] The asteroid's name is a German female name, not related to the discoverer's contemporaries.[2]
Oda belongs to the dynamicalHilda group which is located in theoutermost part of the main belt.[3] Asteroids in this group havesemi-major axis between 3.7 and 4.2 AU and stay in a 3:2resonance with the gas giant Jupiter.Oda, however, is a non-familybackground asteroid, i.e. not a member of the collisionalHilda family (001).[11]
It orbits the Sun in theouter main belt at a distance of 3.4–4.1 AU once every 7 years and 3 months (2,651 days). Its orbit has aneccentricity of 0.09 and aninclination of 10° with respect to theecliptic.[1] The body'sobservation arc begins at Heidelberg, two months after its official discovery observation.[10]
In theTholen classification,Oda is a dark and reddishD-type asteroid.[1] It has also been characterized as anX-type byPanSTARRS photometric survey.[9]
In May 2011, a rotationallightcurve ofOda was obtained from photometric observations in the R-band by astronomers at thePalomar Transient Factory in California. Lightcurve analysis gave arotation period of 44.023 hours with a brightness variation of 0.41magnitude (U=2).[8] A previously measured period of 14.4 is now considered incorrect (U=1).[7]
While not being aslow rotator, which have periods above 100 hours,Oda's spin rate is significantly longer than that of most other asteroids that have periods shorter than 20 hours.
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Oda measures between 56.347 and 64.21 kilometers in diameter and its surface has analbedo between 0.043 and 0.061.[4][5][6]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0583 and a diameter of 57.65 kilometers based on anabsolute magnitude of 9.9.[3]
Thisminor planet was named after a girl's name picked from the German popularcalendarDer Lahrer hinkende Bote (de).
As with913 Otila, 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 theDictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomerIngrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg.[2]
