_Neujmina.png) Shape model ofNeujmina from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | P. Parchomenko |
| Discovery site | Simeiz Obs. |
| Discovery date | 8 August 1929 |
| Designations | |
| (1129) Neujmina | |
Named after | Grigory Neujmin[2] (Soviet astronomer) |
| 1929 PH · 1926 AE A914 WE | |
| main-belt · (outer) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.40 yr (33,384 days) |
| Aphelion | 3.2714AU |
| Perihelion | 2.7734 AU |
| 3.0224 AU | |
| Eccentricity | 0.0824 |
| 5.25yr (1,919 days) | |
| 204.95° | |
| 0° 11m 15.36s / day | |
| Inclination | 8.6174° |
| 269.22° | |
| 139.74° | |
| Physical characteristics | |
| 30.99±7.65 km[5] 32.57±0.72 km[6] 34.43±0.79 km[7] 34.576±0.196 km[8] 34.76±1.4 km[9] 34.80 km(derived)[3] 39.246±0.426 km[10] | |
| 5.0844±0.0006 h[11] 5.089±0.004 h[12] 7.61 h[13] | |
| 0.0999±0.0141[10] 0.12±0.11[5] 0.1216±0.010[9] 0.1270(derived)[3] 0.133±0.007[7] 0.138±0.016[6] | |
| 10.15[3][10][13] · 10.20[1][6][7][9] · 10.33[5] | |
1129 Neujmina (prov. designation:1929 PH) is anEos asteroid from the outer regions of theasteroid belt. It was discovered on 8 August 1929, by astronomerPraskoviya Parchomenko at theSimeiz Observatory on the Crimean peninsula.[14] The stonyS-type asteroid has arotation period of 5.1 hours and measures approximately 34 kilometers (21 miles) in diameter. It was named after Soviet astronomerGrigory Neujmin.[2]
Neujmina is a member theEos family (606),[4] the largestasteroid family of theouter main belt consisting of nearly 10,000 asteroids.[15]: 23 It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,919 days). Its orbit has aneccentricity of 0.08 and aninclination of 9° with respect to theecliptic.[1] The asteroid was first identified asA914 WE at Simeiz in November 1911, followed by1926 AE atHeidelberg in January 1926. The body'sobservation arc begins four weeks after its official discovery observation at Simeiz.[14]
Thisminor planet was named after Georgian–Russian astronomerGrigory Neujmin (1885–1946), adiscoverer of minor planets andcomets, observer atPulkovo Observatory and college of Parchomenko atSimeiz Observatory. Thenaming was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 106). The lunar craterNeujmin was also named in his honor.[2]
In theTholen classification,Neujmina is a stonyS-type asteroid.[1]
In March 2011, a rotationallightcurve ofNeujmina was obtained fromphotometric observations at the Oakley Southern Sky Observatory (E09) in Australia. Lightcurve analysis gave a well-definedrotation period of 5.0844 hours with a brightness variation of 0.20magnitude (U=3).[11] Previous measurements in 1984 and 2008, gave a period of 5.089 and 7.61 hours with an amplitude of 0.15 and 0.06 magnitude, respectively (U=2/2).[12][13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Neujmina measures between 30.99 and 39.246 kilometers in diameter and its surface has analbedo between 0.0999 and 0.138.[5][6][7][8][9][10] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1270 and a diameter of 34.80 kilometers based on anabsolute magnitude of 10.15.[3]
