5535 Annefrank

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5535 Annefrank
Synodic rotation period
15.12 h[5]
15.156±0.0474 h[6]
21.33±0.990 h[7]
0.21±0.03[8]
0.24 (assumed)[3]
0.279±0.092[9]
0.311±0.056[4]
S [3][8]
13.650±0.120 (R)[7] · 13.679±0.001 (R)[6] · 13.7[1][3][4] · 13.88±0.32[10]
Animation of Stardust 's trajectory from 7 February 1999 to 7 April 2011
   Stardust  ·   81P/Wild ·   Earth ·   5535 Annefrank  ·   Tempel 1

5535 Annefrank (

contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter. It was used as a target to practice the flyby technique that the Stardust space probe would later use on the comet Wild 2.[8]

The asteroid was discovered 23 March 1942, by German astronomer

Heidelberg Observatory in southwest Germany.[11] It was named after Anne Frank, a victim of the Holocaust.[2]

Orbit and classification

Annefrank is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 3 months (1,202 days). Its orbit has an eccentricity of 0.06 and an inclination of 4° with respect to the ecliptic.[1]

The body's

Crimea–Nauchnij in 1978, with its identification as 1978 EK6, 36 years after its official discovery observation at Heidelberg.[11]

Physical characteristics

Annefrank has been characterized as a common S-type asteroid.[3][8]

Diameter, albedo and shape

On 2 November 2002, the

contact binary, although other possible explanations exist for its observed shape.[8]

Rotation and poles

In October 2006, ground-based

U=2).[3][5]

In January 2014, photometric observations at the

U=2/2).[6][7]

The lightcurve data suggests that Annefrank is not

Lambertian, meaning that surface features, such as shadows from boulders and craters, play a role in the object's perceived brightness and not just the asteroid's relative size when seen from that orientation.[5]

The body's shortest axis is approximately aligned perpendicular to its

orbital plane.[8]

Naming

This

M.P.C. 25230).[12]

References

  1. ^ a b c d e f "JPL Small-Body Database Browser: 5535 Annefrank (1942 EM)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c d e f g "LCDB Data for (5535) Annefrank". Asteroid Lightcurve Database (LCDB). Retrieved 20 March 2017.
  4. ^
    doi:10.1088/2041-8205/759/1/L8
    . Retrieved 20 March 2017.
  5. ^
    Bibcode:2007LPI....38.1859S
    . Retrieved 20 March 2017.
  6. ^
    doi:10.1088/0004-6256/150/3/75
    . Retrieved 20 March 2017.
  7. ^
    doi:10.1088/0067-0049/219/2/27
    . Retrieved 20 March 2017.
  8. ^
    doi:10.1029/2003JE002108
    . Retrieved 22 June 2017.
  9. doi:10.1016/j.icarus.2010.10.009
    . Retrieved 20 March 2017.
  10. doi:10.1016/j.icarus.2015.08.007
    . Retrieved 20 March 2017.
  11. ^ a b "5535 Annefrank (1942 EM)". Minor Planet Center. Retrieved 20 March 2017.
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 March 2017.
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