4587 Rees

4587 Rees
Discovery
Discovered by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels
Discovery date 30 September 1973
Designations
Named after
 Martin Rees
3239 T-2
former Amor[1]
Mars-crosser[2]
Orbital characteristics[3][2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 20264 days (55.48 yr)
Aphelion 4.01163 AU (600.131 Gm)
Perihelion 1.30696 AU (195.518 Gm)
2.65930 AU (397.826 Gm)
Eccentricity 0.50853
4.34 yr (1584.0 d)
17.02 km/s
319.808°
0° 13m 38.194s / day
Inclination 24.6284°
180.408°
83.9158°
Earth MOID 0.536744 AU (80.2958 Gm)
Jupiter MOID 2.00921 AU (300.574 Gm)
Jupiter Tisserand parameter 3.076
Physical characteristics
Dimensions 2–5 km H
7.7886 h (0.32453 d)
0.32453 d (7.7886 h)[4]
Temperature ~171 K
15.3

    4587 Rees is a former Amor asteroid[1] discovered on September 30, 1973 at the Palomar Observatory by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels.[5] The Provisional designation given to 4587 Rees was 3239 T-2. It has a rotation period of 7.7886 hours.[4] 4587 Rees was named in honor of Martin Rees. Naming it after Professor Lord Rees was proposed by Jan Hendrik Oort.[6]

    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.[2]

    NEO status

    Since all Near-Earth objects (NEOs) have a closest approach to the Sun (perihelion) of less than 1.3 AU,[7] depending on the epoch chosen, the orbital parameters of 4587 Rees will not always qualify it as a NEO. In 2012 it was an amor asteroid.[1][8] As of 2014, Rees has a perihelion of 1.3011 AU and does not meet the requirement to be defined as a NEO.[9]

    References

    1. 1 2 3 Webcite of Epoch 2010-Jan-04
    2. 1 2 3 "JPL Close-Approach Data: 4587 Rees (3239 T-2)" (2008-11-02 last obs (arc=48 years)). Retrieved 11 April 2016.
    3. ↑ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    4. 1 2 "Physical parameters of NEOs". European Asteroid Research Node. Retrieved 2007-12-08.
    5. ↑ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 19 January 2008. Retrieved 2007-12-08.
    6. ↑ Schmadel, L. D. (2003). The Dictionary of Minor Planet Names (5th ed.). Germany: Springer Science+Business Media. ISBN 3-540-00238-3.
    7. ↑ "NEO Groups". NASA/JPL Near-Earth Object Program Office. Retrieved 2012-06-04.
    8. ↑ archive is:DSzY with Epoch 2012-Sep-30
    9. ↑ Horizons output. "Geoentric Osculating Orbital Elements for Asteroid 4587 Rees (3239 T-2)". Retrieved 2012-06-04. (Select Ephemeris Type: Elements)

    External links

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