1477 Bonsdorffia

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
1477 Bonsdorffia
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 6 February 1938
MPC designation (1477) Bonsdorffia
Named after
Ilmari Bonsdorff [2]
(Finnish astronomer)
1938 CC · 1959 WD
main-belt · (outer)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 63.72 yr (23,274 days)
Aphelion 4.0797 AU
Perihelion 2.3192 AU
3.1994 AU
Eccentricity 0.2751
5.72 yr (2,090 days)
0° 10m 19.92s / day
Inclination 15.713°
Physical characteristics
Dimensions 25.85±0.39 km[5]
28.10±1.3 km[6]
29.13±8.63 km[7]
35.87±0.66 km[8]
7.5 h[a]
7.8±0.1 h[b]
Tholen = XU [1][3]
B–V = 0.733 [1]
11.09±0.30[9] · 11.39[7] · 11.59[1][3][6][8] · 11.97[5]

1477 Bonsdorffia, provisional designation 1938 CC, is a background asteroid from the outer regions of the asteroid belt, approximately 29 kilometers in diameter. It was discovered on 6 February 1938, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, Finland.[10] The asteroid was named after Finnish astronomer Ilmari Bonsdorff, who founded the Finnish Geodetic Institute.

Orbit and classification[edit]

Bonsdorffia is a non-family asteroid of the main belt's background population.[4] It orbits the Sun in the outer main-belt at a distance of 2.3–4.1 AU once every 5 years and 9 months (2,090 days). Its orbit has an eccentricity of 0.28 and an inclination of 16° with respect to the ecliptic.[1] The body's observation arc begins 11 days prior to its official discovery observation at Turku.[10]

Physical characteristics[edit]

In the Tholen classification, Bonsdorffia is an X-type asteroid with an unusual spectrum (XU).[1]

Rotation period[edit]

In December 2010, a rotational lightcurve of Bonsdorffia was obtained from photometric observations by astronomer Amadeo Aznar at his Puzol Observatory in Spain (J42). Lightcurve analysis gave a rotation period of 7.8 hours with a brightness amplitude of 0.32 magnitude (U=2).[b] Another lightcurve by Richard Durkee at the SOS Observatory (H39) gave a similar period of 7.5 hours (U=1).[a]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Bonsdorffia measures between 25.85 and 35.87 kilometers in diameter and its surface has an albedo between 0.033 and 0.06.[5][6][7][8]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0517 and a diameter of 28.10 kilometers based on an absolute magnitude of 11.59.[3]


This minor planet was named after Ilmari Bonsdorff (1879–1950), Finnish astronomer and founder and director of the Finnish Geodetic Institute. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 132).[2]


  1. ^ a b Durkee (2011) web: rotation period 7.5 hours with a brightness amplitude of 0.01 mag. Summary figures for (1477) Bonsdorffia at LCDB and SOS Observatory website (archived)
  2. ^ a b Aznar (2011) web: rotation period 7.8±0.1 hours with a brightness amplitude of 0.32 mag. Summary figures for (1477) Bonsdorffia at LCDB and Aznar's website (archived)


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 1477 Bonsdorffia (1938 CC)" (2017-05-06 last obs.). Jet Propulsion Laboratory. Retrieved 20 October 2017. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1477) Bonsdorffia. Springer Berlin Heidelberg. p. 118. ISBN 978-3-540-00238-3. Retrieved 20 October 2017. 
  3. ^ a b c d "LCDB Data for (1477) Bonsdorffia". Asteroid Lightcurve Database (LCDB). Retrieved 20 October 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 20 October 2017. 
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 20 October 2017. 
  6. ^ 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. Bibcode:2004PDSS...12.....T. Retrieved 20 October 2017. 
  7. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 20 October 2017. 
  8. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 20 October 2017. 
  9. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 20 October 2017. 
  10. ^ a b "1477 Bonsdorffia (1938 CC)". Minor Planet Center. Retrieved 20 October 2017. 

External links[edit]