4587 Rees
| Discovery and designation | |
|---|---|
| Discovered by | Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels |
| Discovery date | September 30, 1973 |
| Designations | |
| Named after | Martin Rees |
| Alternative names | 3239 T-2 |
| Minor planet category | Amor |
| Orbital characteristics | |
| Epoch February 4, 2008 (JD 2454500.5) | |
| Aphelion | 600.024 Gm (4.011 AU) |
| Perihelion | 193.687 Gm (1.295 AU) |
| Semi-major axis | 396.856 Gm (2.653 AU) |
| Eccentricity | 0.512 |
| Orbital period | 1578.189 d (4.32 a) |
| Average orbital speed | 17.02 km/s |
| Mean anomaly | 19.001° |
| Inclination | 24.641° |
| Longitude of ascending node | 180.646° |
| Physical characteristics | |
| Dimensions | 2–5 km H |
| Sidereal rotation period | 0.32453 d (7.7886 h)[1] |
| Temperature | ~171 K |
| Absolute magnitude (H) | 15.6 |
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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
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]
References
- ↑ 1.0 1.1 "Physical parameters of NEOs". European Asteroid Research Node. Retrieved 2007-12-08.
- ↑ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 19 January 2008. Retrieved 2007-12-08.
- ↑ Schmadel, L. D. (2003). The Dictionary of Minor Planet Names (5th edition ed.). Germany: Springer Science+Business Media. ISBN 3-540-00238-3.
- ↑ "JPL Close-Approach Data: 4587 Rees (3239 T-2)". 2008-11-02 last obs (arc=48 years). Retrieved 2012-06-04.
- ↑ "NEO Groups". NASA/JPL Near-Earth Object Program Office. Retrieved 2012-06-04.
- ↑ 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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