813 Baumeia (prov. designation: A915 WJ or 1915 YR) is a stony background asteroid from the inner regions of the asteroid belt. It was discovered on 28 November 1915, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany.[1] The common S-type asteroid has a rotation 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 at Heidelberg who was killed in World War I.[2]

813 Baumeia
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date28 November 1915
(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 arc112.84 yr (41,213 d)
Aphelion2.2813 AU
Perihelion2.1646 AU
2.2230 AU
3.31 yr (1,211 d)
0° 17m 50.64s / day
Physical characteristics
Mean diameter
10.543±0.002 h[9][10]
  • 0.2027±0.040[8]
  • 0.256±0.023[7]

Orbit and classificationEdit

Baumeia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5][6] It orbits the Sun in the inner 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 an eccentricity of 0.03 and an inclination of 6° with respect to the ecliptic.[3] The body's observation arc begins with its first observation as A907 GH at Heidelberg on 4 April 1907, more than 8 years prior to its official discovery observation.[1]


This minor planet was named im memory of H. Baum, a German astronomy student at Heidelberg University who was in World War I. The naming was published in the journal Astronomische Nachrichten in 1921 (AN 214, 69). The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 81).[2]

Physical characteristicsEdit

Baumeia is a common, stony S-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 the VISTA Hemisphere Survey conducted with the VISTA telescope at Paranal Observatory in Chile.[11]

Rotation periodEdit

In January 2019, a rotational lightcurve of Baumeia was obtained from photometric observations by European astronomers Bruno Christmann, Raoul Behrend, Anaël Wünsche, Marc Bretton, Rui Goncalves, Josep Bosch. Lightcurve analysis gave a well-defined rotation period of 10.543±0.002 hours with a brightness variation of 0.11±0.01 magnitude (U=3).[9]

The result confirms and refines previous observations by French amateur astronomer René Roy in February 2003, which gave a period of 10.54±0.05 hours with an amplitude of 0.04±0.02 magnitude (U=1),[9] by Jean-Gabriel Bosch at the French Collonges Observatory (178) in February 2006, which gave an identical period of 10.54±0.05 hours with an amplitude of 0.08±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 of 10.544±0.002 hours with an amplitude of 0.18±0.02 magnitude (U=3−).[12]

Diameter and albedoEdit

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE) and the Infrared Astronomical Satellite IRAS, Baumeia measures (11.719±0.660) and (13.50±1.2) kilometers in diameter and its surface has an albedo of (0.256±0.023) and (0.2027±0.040), respectively.[7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2396 and a diameter of 13.61 kilometers based on an absolute magnitude of 11.5.[10] Alternative mean-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]


  1. ^ a b c d e "813 Baumeia (A915 WJ)". Minor Planet Center. Retrieved 25 March 2020.
  2. ^ a b c Schmadel, Lutz D. (2007). "(813) Baumeia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 75. doi:10.1007/978-3-540-29925-7_814. ISBN 978-3-540-00238-3.
  3. ^ a b c d "JPL Small-Body Database Browser: 813 Baumeia (A915 WJ)" (2020-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 25 March 2020.
  4. ^ a b "Asteroid 813 Baumeia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 25 March 2020.
  5. ^ a b c d e "Asteroid 813 Baumeia". Small Bodies Data Ferret. Retrieved 25 March 2020.
  6. ^ a b Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 25 March 2020.} (PDS main page)
  7. ^ a b c d Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M. Retrieved 25 March 2020.
  8. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 25 March 2020.
  9. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (813) Baumeia". Geneva Observatory. Retrieved 25 March 2020.
  10. ^ a b c d "LCDB Data for (813) Baumeia". Asteroid Lightcurve Database (LCDB). Retrieved 25 March 2020.
  11. ^ a b Popescu, M.; Licandro, J.; Carvano, J. M.; Stoicescu, R.; de León, J.; Morate, D.; et al. (September 2018). "Taxonomic classification of asteroids based on MOVIS near-infrared colors". Astronomy and Astrophysics. 617: A12. arXiv:1807.00713. Bibcode:2018A&A...617A..12P. doi:10.1051/0004-6361/201833023. ISSN 0004-6361. (VizieR online cat)
  12. ^ Brinsfield, James W. (April 2009). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2008 4th Quarter" (PDF). Minor Planet Bulletin. 36 (2): 64–66. Bibcode:2009MPBu...36...64B. ISSN 1052-8091. Retrieved 25 March 2020.

External linksEdit