| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 28 November 1915 |
| Designations | |
| (813) Baumeia | |
Named after | H. Baum[2] (German astronomy student) |
| A915 WJ · 1945 WC 1974 QR2 · 1974 QY2 A907 GH · 1915 YR | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.84yr (41,213 d) |
| Aphelion | 2.2813AU |
| Perihelion | 2.1646 AU |
| 2.2230 AU | |
| Eccentricity | 0.0263 |
| 3.31 yr (1,211 d) | |
| 226.31° | |
| 0° 17m 50.64s / day | |
| Inclination | 6.2970° |
| 51.942° | |
| 315.69° | |
| Physical characteristics | |
| 10.543±0.002 h[9][10] | |
813 Baumeia (prov. designation:A915 WJor1915 YR) is a stonybackground asteroid from the inner regions of theasteroid belt. It was discovered on 28 November 1915, by German astronomerMax Wolf at theHeidelberg Observatory in southwest Germany.[1] The commonS-type asteroid has arotation period of 10.5 hours and measures approximately 12 kilometers (7.5 miles) in diameter. It was named for H. Baum, a German student of astronomy atHeidelberg who was killed in World War I.[2]
Baumeia is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5][6] It orbits the Sun in theinner main-belt at a distance of 2.2–2.3 AU once every 3 years and 4 months (1,211 days;semi-major axis of 2.22 AU). Its orbit has aneccentricity of 0.03 and aninclination of 6° with respect to theecliptic.[3] The body'sobservation arc begins with its first observation asA907 GH at Heidelberg on 4 April 1907, more than 8 years prior to its official discovery observation.[1]
Thisminor planet was named im memory of H. Baum, a German astronomy student atHeidelberg University who was in World War I. The naming was published in the journalAstronomische Nachrichten in 1921 (AN 214, 69). Thenaming was also mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 81).[2]
Baumeia is a common, stonyS-type asteroid in both the SMASS-I taxonomy by Xu (1995),[5] as well as in the taxonomic classification based on MOVIS near-infrared colors from the catalog of theVISTA Hemisphere Survey conducted with theVISTA telescope atParanal Observatory in Chile.[11]
In January 2019, a rotationallightcurve ofBaumeia was obtained fromphotometric observations by European astronomers Bruno Christmann,Raoul Behrend, Anaël Wünsche, Marc Bretton, Rui Goncalves,Josep Bosch. Lightcurve analysis gave a well-definedrotation period of10.543±0.002 hours with a brightness variation of0.11±0.01magnitude (U=3).[9]
The result confirms and refines previous observations by French amateur astronomerRené Roy in February 2003, which gave a period of10.54±0.05 hours with an amplitude of0.04±0.02 magnitude (U=1),[9] by Jean-Gabriel Bosch at the French Collonges Observatory (178) in February 2006, which gave an identical period of10.54±0.05 hours with an amplitude of0.08±0.05 magnitude (U=1),[9] by James W. Brinsfield at the Via Capote Observatory (G69) in Australia in November 2008, which gave the first secured period of10.544±0.002 hours with an amplitude of0.18±0.02 magnitude (U=3−).[12]
According to the surveys carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE) and the Infrared Astronomical SatelliteIRAS,Baumeia measures (11.719±0.660) and (13.50±1.2) kilometers in diameter and its surface has analbedo of (0.256±0.023) and (0.2027±0.040), respectively.[7][8] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.2396 and a diameter of 13.61 kilometers based on anabsolute magnitude of 11.5.[10] Alternativemean diameter measurements published by the WISE team include (12.408±0.071 km) and (13.45±2.95 km) with corresponding albedos of (0.2434±0.0250) and (0.30±0.19).[5][10]
