1045 Michela

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1045 Michela
Discovery [1]
Discovered by G. van Biesbroeck
Discovery site Yerkes Obs.
Discovery date 19 November 1924
MPC designation (1045) Michela
Named after
Micheline van Biesbroeck [2]
(discoverer's daughter)
1924 TR · 1953 VB2
1964 XJ · 1976 AL
main-belt[1][3] · (inner)
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 63.64 yr (23,246 d)
Aphelion 2.7348 AU
Perihelion 1.9811 AU
2.3580 AU
Eccentricity 0.1598
3.62 yr (1,323 d)
0° 16m 19.92s / day
Inclination 0.2648°
Physical characteristics
Mean diameter
6.104±0.265 km[5]
SMASS = S[3]

1045 Michela, provisional designation 1924 TR, is an stony Massalian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers (4 miles) kilometers in diameter. It was discovered on 19 November 1924, by Belgian–American astronomer George Van Biesbroeck at the Yerkes Observatory in Williams Bay, Wisconsin, United States.[1] The S-type asteroid was named after the discoverer's daughter, Micheline van Biesbroeck.[2]

Orbit and classification[edit]

Michela is a member of the Massalia family (404),[4] a very large inner belt asteroid family consisting of stony asteroids.[6] It orbits the Sun in the inner main-belt at a distance of 2.0–2.7 AU once every 3 years and 7 months (1,323 days; semi-major axis of 2.36 AU). Its orbit has an eccentricity of 0.16 and an inclination of 0° with respect to the ecliptic.[3]

The asteroid's observation arc begins with its observation as 1953 VB2 at the Goethe Link Observatory in November 1953, or 29 years after to its official discovery observation.[1]

Physical characteristics[edit]

In the SMASS classification, Michela is a common, stony S-type asteroid,[3] which is also the overall spectral type for Massalian asteroids.[6]:23

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Michela measures 6.104 kilometers in diameter and its surface has an albedo of 0.328.[5]

Rotation period[edit]

As of 2018, no rotational lightcurve of Michela has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[3]


This minor planet was named after Micheline van Biesbroeck, daughter of the discoverer George Van Biesbroeck. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 99).[2]


  1. ^ a b c d "1045 Michela (1924 TR)". Minor Planet Center. Retrieved 20 March 2018. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1045) Michela. Springer Berlin Heidelberg. p. 89. ISBN 978-3-540-00238-3. Retrieved 20 March 2018. 
  3. ^ a b c d e f g "JPL Small-Body Database Browser: 1045 Michela (1924 TR)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 20 March 2018. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 20 March 2018. 
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 20 March 2018. 
  6. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 20 March 2018. 

External links[edit]