| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 8 February 1927 |
| Designations | |
| (1154) Astronomia | |
| Pronunciation | /æstroʊˈnoʊmiə/ |
Named after | astronomy[2] (anatural science) |
| 1927 CB · A911 RA | |
| main-belt · (outer)[1][3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 105.83 yr (38,656 days) |
| Aphelion | 3.6308AU |
| Perihelion | 3.1511 AU |
| 3.3910 AU | |
| Eccentricity | 0.0707 |
| 6.24yr (2,281 days) | |
| 22.461° | |
| 0° 9m 28.08s / day | |
| Inclination | 4.5323° |
| 82.512° | |
| 203.85° | |
| Physical characteristics | |
| Dimensions | 55.4±5.5 km[5] 55.715±0.500 km[6] 57.253±0.339 km[7] 59±6 km[8] 59.68±18.01 km[9] 60.10±16.38 km[10] 61.08 km(SIMPS)[3][11] 64.20±1.11 km[12] |
| 18.1154±0.0139h[a] | |
| 0.028±0.001[12] 0.0296(SIMPS)[3][11] 0.03±0.01[8] 0.03±0.02[9] 0.03±0.03[10] 0.0337±0.0060[7] 0.036±0.008[6] 0.04±0.01[5] | |
| Tholen = FXU:[1][3] B–V = 0.658[1] U–B = 0.229[1] | |
| 10.46[10] · 10.51[1][3][5][7][8][9][12] · 10.80±0.10[13] | |
1154 Astronomia, provisional designation1927 CB, is a carbonaceous backgroundasteroid from the outer regions of theasteroid belt, approximately 60 kilometers in diameter. It was discovered by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory on 8 February 1927.[14] The asteroid was named for the natural science ofastronomy.
Astronomia is abackground asteroid, that is, not a member of any knownasteroid family.[4] It orbits the Sun in theouter main-belt at a distance of 3.2–3.6 AU once every 6 years and 3 months (2,281 days). Its orbit has aneccentricity of 0.07 and aninclination of 5° with respect to theecliptic.[1]
The asteroid was first identified asA911 RA at Heidelberg in September 1911. The body'sobservation arc begins the night after its official discovery observation at Heidelberg.[14]
In theTholen classification,Astronomia has an ambiguousspectral type, closest to a carbonaceousF-type and somewhat similar to that of anX-type asteroid. Its spectrum has also been flagged as unusual and of poor quality (FXU:).[1]
In May 2016, the first rotationallightcurve ofAstronomia was obtained from photometric observations. Lightcurve analysis gave arotation period of 18.1154 hours with a brightness variation of 0.39magnitude (U=3-).[a]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Astronomia measures between 55.4 and 64.20 kilometers in diameter and its surface has analbedo between 0.028 and 0.04.[5][6][7][8][9][10][12]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0296 and a diameter of 61.08 kilometers based on anabsolute magnitude of 10.51.[3][11]
Thisminor planet was named after the natural science ofastronomy, a study ofcelestial objects,observations and phenomena in thenight sky. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 108).[2]
