| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 31 August 1935 |
| Designations | |
| (1370) Hella | |
Named after | Helene Nowacki[2] (ARI-astronomer) |
| 1935 QG | |
| main-belt · (inner) Flora[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.46 yr (29,754 days) |
| Aphelion | 2.6343AU |
| Perihelion | 1.8665 AU |
| 2.2504 AU | |
| Eccentricity | 0.1706 |
| 3.38yr (1,233 days) | |
| 130.52° | |
| 0° 17m 31.2s / day | |
| Inclination | 4.8039° |
| 306.04° | |
| 3.9960° | |
| Physical characteristics | |
| Dimensions | 5.41 km(calculated)[3] |
| 7.5408h[5] inconclusive[3] | |
| 0.24(assumed)[3] | |
| S(assumed)[3] | |
| 13.5[1][3] · 13.69±0.63[6] | |
1370 Hella, provisional designation1935 QG, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 5.4 kilometers in diameter. It was discovered on 31 August 1935, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[7] The asteroid was named forHelene Nowacki, an astronomer at theAstronomical Calculation Institute.[2]
Hella is a member of theFlora family (402),[3][4] a giantasteroid family and the largest family of stony asteroids in the main belt.[8]: 23
It orbits the Sun in theinner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,233 days). Its orbit has aneccentricity of 0.17 and aninclination of 5° with respect to theecliptic.[1] The body'sobservation arc begins at Heidelberg in September 1935, one month after its official discovery observation.[7]
According to its classification as a Florian asteroid,Hella is an assumed stonyS-type asteroid.[3]
In October 2006, a rotationallightcurve ofHella was obtained from photometric observations by French amateur astronomerLaurent Bernasconi. Lightcurve analysis gave an inconclusiverotation period of 7.5408 hours with a brightness amplitude of 0.17magnitude (U=n.a.).[5] The Lightcurve Data Base, however, only lists the measured brightness variation. As of 2017, no secure period ofHella has been obtained.[3]
Hella has not been observed by any of the space-based surveys, such as theInfrared Astronomical Satellite (IRAS), the JapaneseAkari satellite or theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer. TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora the parent body of the Flora Family – and calculates a diameter of 5.41 kilometers based on anabsolute magnitude of 13.5.[3]
Thisminor planet was named afterHelene Nowacki (1904–1972), a German astronomer of theAstronomical Calculation Institute. The name was suggested by astronomerGustav Stracke. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 124).[2]
