| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 22 April 1927 |
| Designations | |
| (1209) Pumma | |
Named after | Niece of discoverer's friend[2] |
| 1927 HA · 1950 JQ 1963 UU | |
| main-belt · (outer)[3] Hygiea[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 90.20 yr (32,945 days) |
| Aphelion | 3.5836AU |
| Perihelion | 2.7590 AU |
| 3.1713 AU | |
| Eccentricity | 0.1300 |
| 5.65yr (2,063 days) | |
| 302.93° | |
| 0° 10m 28.2s / day | |
| Inclination | 6.9333° |
| 89.806° | |
| 176.87° | |
| Physical characteristics | |
| Dimensions | 21.73±2.15 km[5] 26.889±0.253 km[6] 26.986±0.311 km[7] 40.33 km (calculated)[3] |
| 8.5001±0.0001h[8] | |
| 0.057 (assumed)[3] 0.1397±0.0360[7] 0.141±0.028[6] 0.215±0.055[5] | |
| C (assumed)[3] | |
| 10.60[5][7] · 10.62±0.19[9] · 10.7[1][3] | |
1209 Pumma (provisional designation1927 HA) is aHygieanasteroid from the outer region of theasteroid belt, approximately 30 kilometers in diameter. It was discovered on 22 April 1927, by German astronomerKarl Reinmuth atHeidelberg Observatory in southwest Germany.[10] The asteroid was named after the niece of astronomerAlbrecht Kahrstedt.[2]
Pumma is a member of theHygiea family (601),[4] a very largefamily of carbonaceous outer-belt asteroids, named after thefourth-largest asteroid,10 Hygiea.[11] It orbits the Sun in theouter main-belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,063 days). Its orbit has aneccentricity of 0.13 and aninclination of 7° with respect to theecliptic.[1] Noprecoveries were taken, and no prior identifications were made. The body'sobservation arc begins atUccle, 8 days after its official discovery observation at Heidelberg.[10]
In April 2012, a rotationallightcurve of Pumma was obtained from photometric observations by Italian and French amateur astronomersSilvano Casulli andRené Roy. Lightcurve analysis gave a well-definedrotation period of 8.5001 hours with a brightness variation of 0.28magnitude (U=3).[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Pumma measures between 21.73 and 26.99 kilometers in diameter, and its surface has analbedo between 0.139 and 0.215.[5][6][7] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceousC-type asteroids of 0.057 and consequently calculates a much larger diameter of 40.33 kilometers using anabsolute magnitude of 10.7.[3]
Thisminor planet's name was proposed by German astronomer Albrecht Kahrstedt (1897–1971), a staff member atARI and later director atBabelsberg Observatory(also see1587 Kahrstedt). "Pumma" is the nickname of a niece of Kahrstedt.[2][12][13] The official naming citation was published byPaul Herget inThe Names of the Minor Planets in 1955 (H 112).[2]
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