(85770) 1998 UP1

1998 UP₁

Discovery[1]
Discovered by	1998-10-18 by LINEAR
Discovery site	Socorro
Designations
Alternate name(s)	(85770)
Minor planet category	Aten
Orbital characteristics[1]
Epoch 2455000.5 (2009-Jun-18.0)
Aphelion	1.343000170 ± 3.545e-09 AU
Perihelion	.65417453 ± 6.8839e-07 AU
Semi-major axis	.99858735183 ± 2.6359e-09 AU
Eccentricity	.34490004 ± 6.8807e-07
Orbital period	364.483202 ± 1.4431e-06 d 1.00 yr ± 3.951e-09
Mean anomaly	342.40621 ± 6.9834e-05°
Inclination	33.17885 ± 6.4782e-05°
Longitude of ascending node	18.388447 ± 7.7329e-06°
Argument of perihelion	234.35098 ± 3.1974e-05°
Physical characteristics
Absolute magnitude (H)	20.374

1998 UP₁ is a near Earth, Aten asteroid orbiting at nearly a 1:1 resonance with Earth.

Orbit

With an orbital period of 364.48 d, 1998 UP₁ is in a near perfect 1:1 orbital Resonance with Earth. Although their periods are almost identical, their orbits are very different; 1998 UP₁ has a highly eccentric orbit and moves between .65 AU and 1.35 AU during the year, it is also very highly inclined at 33°.^[1] The period of 1998 UP₁ was originally thought to be slightly longer than 1 year producing an error in the predicted position of about 35 degrees; it was selected as a priority for recovery and recovered by the Camarillo Observatory on 12 October 1999.^[2]

External links

• NASA JPL Small-Body Database Browser on (85770) 1998 UP1
• MPEC 1998-U17
• MPEC 1999-T52

References

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