| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. |
| Discovery date | 23 April 1930 |
| Designations | |
| (1267) Geertruida | |
Named after | Geertruid Hamerslag Pels[2] (Sister of astronomerGerrit Pels) |
| 1930 HD · 1926 GV 1927 SH · 1930 LA 1954 TM1 · 1965 HB 1965 JE | |
| main-belt · (inner)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.55 yr (33,440 days) |
| Aphelion | 2.9116AU |
| Perihelion | 2.0260 AU |
| 2.4688 AU | |
| Eccentricity | 0.1794 |
| 3.88yr (1,417 days) | |
| 136.63° | |
| 0° 15m 14.76s / day | |
| Inclination | 4.7825° |
| 24.390° | |
| 268.19° | |
| Physical characteristics | |
| Dimensions | 15.621±4.700 km[5] 16.92±5.04 km[6] 17.16±0.30 km[7] 18.91±0.25 km[8] 20.92±0.60 km[9] 23.108±0.154 km[10] 23.41±1.4 km[11] 23.43 km(derived)[3] 23.572±0.153 km[12] |
| 5.50h[13] 5.5087±0.0007 h[14] | |
| 0.030±0.002[12] 0.0466±0.006[11] 0.0479±0.0062[10] 0.0510(derived)[3] 0.060±0.004[9] 0.06±0.01[8] 0.0706±0.0488[5] 0.09±0.07[6] 0.095±0.014[7] | |
| C(assumed)[3] | |
| 12.00[3][7] · 12.10[1][5][6][9][10][11] · 12.17[8] | |
1267 Geertruida, provisional designation1930 HD, is a carbonaceous backgroundasteroid from the inner regions of theasteroid belt, approximately 20 kilometers in diameter. Discovered by astronomerHendrik van Gent atJohannesburg Observatory in 1930, the asteroid was later named after Geertruid Pels, sister of Dutch astronomerGerrit Pels.[2][15]
Geertruida was discovered on 23 April 1930, by Dutch astronomerHendrik van Gent at theUnion Observatory in Johannesburg, South Africa.[15] Five nights later, it was independently discovered by German astronomerKarl Reinmuth atHeidelberg Observatory on 28 April 1930.[2] TheMinor Planet Center only recognizes the first discoverer.[15] The asteroid was previously identified as1926 GV at Heidelberg Observatory in April 1926.[15]
Geertruida is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theinner asteroid belt at a distance of 2.0–2.9 AU once every 3 years and 11 months (1,417 days;semi-major axis of 2.47 AU). Its orbit has aneccentricity of 0.18 and aninclination of 5° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Johannesburg in April 1930.[15]
Geertruida is an assumed carbonaceousC-type asteroid, which agrees with its measured albedo(see below).[3]
In 1977, a rotationallightcurve ofGeertruida was obtained from photometric observations by Swedish astronomerClaes-Ingvar Lagerkvist at the Uppsala Southern Station in Australia. Lightcurve analysis gave arotation period of 5.50 hours with a brightness amplitude of 0.5magnitude (U=2).[13] In October 2016, a refined period of 5.5087 hours with an amplitude of 0.35 magnitude (U=3) was obtained at the Oakley Southern Sky Observatory (E09).[14]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Geertruida measures between 15.621 and 23.572 kilometers in diameter and its surface has analbedo between 0.030 and 0.095.[5][6][7][8][9][10][11][12]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0510, typical for that of a carbonaceous asteroid, and a diameter of 23.43 kilometers based on anabsolute magnitude of 12.0.[3]
Thisminor planet was named by Dutch astronomerGerrit Pels after his sister Geertruid (or Geertruida) Hamerslag Pels. Gerrit Pels, who was an assistant astronomer atLeiden Observatory, computed the body's orbit. The minor planet1667 Pels was named in his honor. The author of theDictionary of Minor Planet Names,Lutz Schmadel learned about the meaning of this asteroid fromIngrid van Houten-Groeneveld, who was a long-time astronomer at Leiden Observatory.[2]
