(9928) 1981 WE9

(9928) 1981 WE₉

Orbit of (9928) 1981 WE9 (blue), planets (red) and the Sun (black). The outermost planet visible is Jupiter.
Discovery
Discovered by	Perth Observatory
Discovery date	16 November 1981
Designations
MPC designation	(9928) 1981 WE9
Alternative names	1971 TJ1, 1993 FC43
Minor planet category	Main Belt asteroid
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	23598 days (64.61 yr)
Aphelion	2.6102853 AU (390.49312 Gm)
Perihelion	1.8267175 AU (273.27305 Gm)
Semi-major axis	2.2185014 AU (331.88309 Gm)
Eccentricity	0.1765984
Orbital period	3.30 yr (1206.9 d)
Mean anomaly	161.48772°
Mean motion	0° 17^m 53.784^s / day
Inclination	2.845283°
Longitude of ascending node	179.44727°
Argument of perihelion	175.82661°
Earth MOID	0.820125 AU (122.6890 Gm)
Jupiter MOID	2.81813 AU (421.586 Gm)
Physical characteristics
Dimensions	~12.9 km[2]
Rotation period	18.3980 h (0.76658 d)
Sidereal rotation period	5.547 h[3]
Geometric albedo	~0.01
Surface temp. min mean max Kelvin Celsius
Absolute magnitude (H)	14.7

(9928) 1981 WE₉ is a main belt asteroid. It orbits the Sun once every 3.30 years.^[1] It is associated with the Flora family of asteroids.^[4]

Discovered on November 16, 1981, by the Perth Observatory in Bickley, it was given the provisional designation "1981 WE₉".^[5]

References

1. "JPL Small-Body Database Browser: 9928 (1981 WE9)". NASA/Jet Propulsion Laboratory. Retrieved 5 April 2016.
2. Tedesco E.F.; Noah P.V.; Noah M.; Price S.D. "The supplemental IRAS minor planet survey (SIMPS)".
3. Maurice Clark. "Asteroid 9928 1981 WE9". Montgomery College.
4. Zappalà, Vincenzo; Bendjoya, Philippe; Cellino, Alberto; Farinella, Paolo; Froeschlé, Claude (1997). "Asteroid Dynamical Families.". EAR-A-5-DDR-FAMILY-V4.1. NASA Planetary Data System.
5. MPO 65995 Minor Planet Center

External links

• (9928) 1981 WE9 at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters