(27709) Orenburg

Asteroid (27709) Orenburg
Properties of the orbit ( animation ) Epoch: April 27, 2019 ( JD 2,458,600.5)
Orbit type	Main outer belt asteroid
Asteroid family	Eos family
Major semi-axis	2.9975 AU
eccentricity	0.0718
Perihelion - aphelion	2.7823 AU - 3.2127 AU
Inclination of the orbit plane	9.3666 °
Length of the ascending node	285.9642 °
Argument of the periapsis	168.9878 °
Sidereal period	5.19 a
Mean orbital velocity	17.18 km / s
Physical Properties
Medium diameter	8.087 km (± 0.290)
Albedo	0.205 (± 0.016)
Absolute brightness	13.1 mag
history
Explorer	Eric Walter Elst
Date of discovery	February 13, 1988
Another name	1988 CU ₃ , 1997 YM ₁₆
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(27709) Orenburg is an asteroid of the outer main belt , which was discovered on February 13, 1988 by the Belgian astronomer Eric Walter Elst at the La Silla Observatory of the European Southern Observatory in Chile ( IAU code 809).

The asteroid belongs to the Eos family , a group of asteroids which typically have large semiaxes from 2.95 to 3.1 AU , bounded inward by the Kirkwood gap of the 7: 3 resonance with Jupiter , and orbital inclinations between 8 ° and 12 °. The group is named after the asteroid (221) Eos . The family is believed to have emerged from a collision more than a billion years ago. The ageless (not osculating ) orbital elements of (27709) Orenburg are almost identical with those of the two smaller, when one of the absolute brightness starting from 15.6 and 16.1 compared to 12.9, asteroids (230655) 2003 SM ₁₀₁ and ( 360932) 2005 TJ ₁₃₃ .

The mean diameter of (27709) Orenburg was calculated to be 8.087 km (± 0.290), the albedo as 0.205 (± 0.016).

The asteroid was named after the Russian city of Orenburg on June 1, 2007 .

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