.png) Lightcurve-based 3D-model ofGerti | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 21 January 1925 |
| Designations | |
| (1382) Gerti | |
Named after | Gertrud Höhne[2] (ARI secretary) |
| 1925 BB · 1929 LH 1933 UL1 · 1936 QB1 | |
| main-belt · (inner) Flora[3] · background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.18 yr (33,670 days) |
| Aphelion | 2.5119AU |
| Perihelion | 1.9274 AU |
| 2.2196 AU | |
| Eccentricity | 0.1317 |
| 3.31yr (1,208 days) | |
| 258.61° | |
| 0° 17m 52.8s / day | |
| Inclination | 1.5621° |
| 353.04° | |
| 246.96° | |
| Physical characteristics | |
| Dimensions | 8.54 km(derived)[3] 9.14±0.95 km[5] 9.75±1.68 km[6] 11.94±0.19 km[7] |
| 3.0±0.2h[8] 3.081545±0.000005 h[9] 3.082±0.0004 h[10] 3.082±0.002 h[11] | |
| 0.196±0.024[7] 0.24(assumed)[3] 0.278±0.059[5] 0.28±0.08[6] | |
| S(assumed)[3] | |
| 11.765±0.000(R)[10] · 12.00[1][7] · 12.04±0.28[12] · 12.20[5] · 12.27[6] · 12.51[3] · 12.51±0.01[11][13] | |
1382 Gerti, provisional designation1925 BB, is a Florianasteroid from the inner regions of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 21 January 1925, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[14] The asteroid was named after a secretary of theAstronomical Calculation Institute, Gertrud Höhne.
Gerti has been dynamically classified as a member of theFlora family (402), a giantasteroid family and the largest family of stony asteroids in the main-belt.[3] It is, however, a non-family asteroid of the main belt'sbackground population when applying theHierarchical Clustering Method to itsproper orbital elements (both by Nesvorný as well as by Novakovic, Knežević and Milani).[4]
It orbits the Sun in theinner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,208 days). Its orbit has aneccentricity of 0.13 and aninclination of 2° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Heidelberg in January 1925.[14]
The LCDB assumes it to be a stonyS-type asteroid, due to its dynamical classification as a member of the Flora family (402).[3]
Two rotationallightcurve ofGerti were obtained from photometric observations byWiesław Wiśniewski in February 1988, and by astronomers at thePalomar Transient Factory in January 2011, respectively. Lightcurve analysis gave an identicalrotation period of 3.082 hours with a respective brightness amplitude of 0.20 and 0.29magnitude (U=3/2).[10][11] A third lightcurve byRené Roy in March 2008 gave a period of 3.0 hours with an amplitude of 0.36 magnitude (U=2).[8]
In 2011, a modeled lightcurve using data from theUppsala Asteroid Photometric Catalogue and other sources gave a concurring sidereal period of 3.081545 hours, as well as two spin axis of (268.0°, 23.0°) and (87.0°, 28.0°) inecliptic coordinates (λ, β).[9]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Gerti measures between 9.14 and 11.94 kilometers in diameter and its surface has analbedo between 0.196 and 0.28.[5][6][7]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – taken from8 Flora, the Flora family's parent body – and derives a diameter of 8.54 kilometers based on anabsolute magnitude of 12.51.[3]
Thisminor planet was named after Gertrud Höhne who was a secretary at the BerlinAstronomical Calculation Institute (German:Astronomisches Rechen-Institut. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 125).[2]
