astro.wikisort.org - Asteroid

4587 Rees, provisional designation 3239 T-2, is a Mars-crosser and former near-Earth object on an eccentric orbit from the asteroid belt, approximately 2 kilometers (1.2 miles) in diameter. It was discovered during the second Palomar–Leiden Trojan survey on 30 September 1973, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at the Palomar Observatory in California.[1] The assumed S-type asteroid has a rotation period of 7.9 hours and is likely elongated in shape.[3] It was named after British astrophysicist Martin Rees.[1]

4587 Rees

Discovery [1]
Discovered by	C. J. van Houten I. van Houten-G. T. Gehrels
Discovery site	Palomar Obs.
Discovery date	30 September 1973
Designations
MPC designation	(4587) Rees
Named after	Martin Rees [1] (British cosmologist)
Alternative designations	3239 T-2 · 1990 HQ 6378 P-L
Minor planet category	Mars-crosser formerly Amor[lower-alpha 1]
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc	57.10 yr (20,855 d)
Aphelion	4.0117 AU
Perihelion	1.3057 AU
Semi-major axis	2.6587 AU
Eccentricity	0.5089
Orbital period (sidereal)	4.34 yr (1,583 d)
Mean anomaly	232.48°
Mean motion	0° 13m 38.64s / day
Inclination	24.626°
Longitude of ascending node	180.37°
Argument of perihelion	83.989°
Earth MOID	0.5364 AU (209 LD)
TJupiter	3.0760
Physical characteristics
Mean diameter	2.03 km (calculated)[3]
Synodic rotation period	7.879±0.002 h[4][lower-alpha 2]
Geometric albedo	0.20 (assumed)[3]
Spectral type	S/Sr (assumed)[3][5]
Absolute magnitude (H)	15.3[1][2] 15.87[3]

Orbit and classification

Rees is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.66 AU.[1] It orbits the Sun at a distance of 1.31–4.01 AU once every 4 years and 4 months (1,583 days; semi-major axis of 2.66 AU). Its orbit has a high eccentricity of 0.51 and an inclination of 25° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 6378 P-L at Palomar in September 1960, or 13 years prior to its official discovery observation.[1]

Former near-Earth object

Before 2014, Rees has been a near-Earth object of the Amor group,[lower-alpha 1] as its perihelion was slightly less than 1.3 AU due to the body's osculating orbit.[6][7]

Close approaches

In July 2072, Rees will pass 20,686,000 km (0.13828 AU) from Mars, the closest since it passed 15,810,000 km (0.1057 AU) from the Red Planet on 28 January 1843. The asteroid will also pass 7,110,000 km (0.0475 AU) from the second largest asteroid, 4 Vesta, on 30 January 2121.[8]

Palomar–Leiden Trojan survey

The survey designation "T-2" stands for the second Palomar–Leiden Trojan survey, named after the fruitful collaboration of the Palomar and Leiden Observatory in the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroid discoveries.[9]

Naming

This minor planet was named after Martin Rees (born 1942), a much awarded English cosmologist and astrophysicist who has studied the galactic evolution. Rees became Astronomer Royal and President of the Royal Society in 1995 and 2005, respectively. He is also the director of the Institute of Astronomy and a professor of astronomy at the University of Cambridge. The asteroid's name was proposed by Jan Oort, and the official citation was published by the Minor Planet Center on 28 April 1991 (M.P.C. 18143).[10]

Physical characteristics

Rees is an assumed, stony S-type asteroid.[3] Other sources published by EARN assume an Sr-subtype that transitions from the S-type to the rare R-type asteroids.[5]

Rotation period

In May 2016, a rotational lightcurve of Rees was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in California. Lightcurve analysis gave a well-defined rotation period of 7.879±0.002 hours with a brightness variation of 0.55 magnitude (U=3), indicative of an elongated, non-spheroidal shape.[4][lower-alpha 2] The result confirms previous observations by Czech astronomer Petr Pravec (7.7886 h) and by astronomers at the Palomar Transient Factory (7.790 h) from April 2003 and October 2012, respectively (U=3/2).[3][11][lower-alpha 3]

Diameter and albedo

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for an S-type asteroid of 0.20 and calculates a diameter of 2.03 kilometers based on an absolute magnitude of 15.87.[3]

Notes

References

External links

• Asteroid 4587 Rees, Small Bodies Data Ferret
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 4587 Rees at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4587 Rees at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (4587) Rees

(4587) Rees ist ein am 30. September 1973 entdeckter Asteroid des Amor-Typs. Der Asteroid wurde am Palomar-Observatorium von Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld und Tom Gehrels entdeckt.

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- [en] 4587 Rees

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[ru] (4587) Рис

(4587) Рис (англ. Rees) — околоземный астероид из группы Амура (III), который был открыт 30 сентября 1973 года нидерландскими астрономами К. Й. ван Хаутеном, И. ван Хаутен-Груневельд и Томом Герельсом в Паломарской обсерватории и назван в честь британского космолога и астрофизика Мартина Риса. Название было предложено нидерландским астрономом Яном Оортом[2].

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