4587 Rees

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4587 Rees
Discovery[1] and designation
Discovered by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels
Discovery date September 30, 1973
Named after
Martin Rees
3239 T-2
Minor planet category Amor
Orbital characteristics[2]
Epoch February 4, 2008 (JD 2454500.5)
Aphelion 600.024 Gm (4.011 AU)
Perihelion 193.687 Gm (1.295 AU)
396.856 Gm (2.653 AU)
Eccentricity 0.512
1578.189 d (4.32 a)
17.02 km/s
Inclination 24.641°
Physical characteristics
Dimensions 2–5 km H
0.32453 d (7.7886 h)[1]
Temperature ~171 K

4587 Rees is an Amor asteroid discovered on September 30, 1973 at the Palomar Observatory by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels.[2] The Provisional designation given to 4587 Rees was 3239 T-2. It has a rotation period of 7.7886 hours.[1] 4587 Rees was named in honor of Martin Rees. Naming it after Professor Lord Rees was proposed by Jan Hendrik Oort.[3]

On 2072-Jul-03 Rees will pass 0.13828 AU (20,686,000 km; 12,854,000 mi) from Mars, the closest since it passed 0.1057 AU (15,810,000 km; 9,830,000 mi) from Mars on 1843-Jan-28. On 2121-Jan-30, Rees will pass 0.0475 AU (7,110,000 km; 4,420,000 mi) from 4 Vesta.[4]

NEO status[edit]

Since all Near-Earth objects (NEOs) have a closest approach to the Sun (perihelion) of less than 1.3 AU,[5] depending on the epoch chosen, the orbital parameters of 4587 Rees will not always qualify it as a NEO. For example, in the year 2014 Rees will have a perihelion of 1.3011 AU and will not meet the requirement to be defined as a NEO.[6]


  1. ^ a b "Physical parameters of NEOs". European Asteroid Research Node. Retrieved 2007-12-08. 
  2. ^ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 19 January 2008. Retrieved 2007-12-08. 
  3. ^ Schmadel, L. D. (2003). The Dictionary of Minor Planet Names (5th edition ed.). Germany: Springer Science+Business Media. ISBN 3-540-00238-3. 
  4. ^ "JPL Close-Approach Data: 4587 Rees (3239 T-2)" (2008-11-02 last obs (arc=48 years)). Retrieved 2012-06-04. 
  5. ^ "NEO Groups". NASA/JPL Near-Earth Object Program Office. Retrieved 2012-06-04. 
  6. ^ Horizons output. "Geoentric Osculating Orbital Elements for Asteroid 4587 Rees (3239 T-2)". Retrieved 2012-06-04.  (Select Ephemeris Type: Elements)

External links[edit]