| Discovery[1] | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 14 September 1931 |
| Designations | |
| (1199) Geldonia | |
| Pronunciation | /ɡɛlˈdoʊniə/ |
Named after | Jodoigne[2] (Belgian city) |
| 1931 RF · 1930 MB 1946 OH · 1958 WC A921 TF | |
| main-belt · (outer) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 95.48 yr (34,873 days) |
| Aphelion | 3.1016AU |
| Perihelion | 2.9337 AU |
| 3.0177 AU | |
| Eccentricity | 0.0278 |
| 5.24yr (1,915 days) | |
| 324.45° | |
| 0° 11m 16.8s / day | |
| Inclination | 8.7917° |
| 235.63° | |
| 291.33° | |
| Physical characteristics | |
| Dimensions | 30.395±0.243 km[5] 31.25±3.0 km[3][6] 32.858±0.315 km[7] 35.88±0.50 km[8] 36.08±0.58 km[9] |
| 28.3±0.2h[10] | |
| 0.098±0.004[9] 0.098±0.010[8] 0.1182±0.0108[7] 0.1299±0.029[6][3] | |
| Tholen = CGTP:[1][3] B–V = 0.760[1] U–B = 0.330[1] | |
| 10.36[1][3][6][7][8][9] | |
1199 Geldonia (provisional designation1931 RF) is an Eoanasteroid from the outer regions of theasteroid belt, approximately 32 kilometers in diameter. It was discovered on 14 September 1931, by Belgian astronomerEugène Delporte at theRoyal Observatory of Belgium in Uccle.[11] The asteroid was named after the Belgian town ofJodoigne.[2]
Geldonia is a member theEos family (606),[4] the largestasteroid family of theouter main belt consisting of nearly 10,000 asteroids.[12]: 23 It orbits the Sun at a distance of 2.9–3.1 AU once every 5 years and 3 months (1,915 days). Its orbit has aneccentricity of 0.03 and aninclination of 9° with respect to theecliptic.[1]
The body'sobservation arc begins with its first identification asA921 TF atHeidelberg Observatory in October 1921, almost 10 years prior to its official discovery observation at Uccle.[11]
In theTholen classification, Geldonia has an ambiguousspectral type, closest to a carbonaceousC-type asteroid with some similarities to theG-,T- and the primitiveP-type asteroids, and was flagged as a nosy spectrum (CGTP:).[1][3] The overall spectral type for members of the Eoan family on the other hand is that of aK-type.[12]: 23
In November 2010, a rotationallightcurve of Geldonia was obtained from photometric observations by Italian astronomerSilvano Casulli. Lightcurve analysis gave a longer-than-averagerotation period of 28.3 hours with a brightness amplitude of 0.11magnitude (U=2-). While not being aslow rotator, which have periods longer than 100 hours,Geldonia's spin rate is still longer than that of most minor planets, which typically rotate between 2 and 20 hours once around their axis.
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Geldonia measures between 30.395 and 36.08 kilometers in diameter and its surface has analbedo between 0.098 and 0.1182.[5][7][8][9]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained byInfrared Astronomical Satellite, that is, an albedo of 0.1299 and a diameter of 31.25 kilometers based on anabsolute magnitude of 10.36.[3][6]
Thisminor planet was named after the Belgian town ofJodoigne, also known by its Latin name of Geldenaken (hence the asteroid's name of "Geldonia"). It is the native town of the discovererEugène Delporte. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 111).[2]
