X-Spectral Class Object (153201) 2000 WO107 to pass Earth November 29, 2020


Cosmographia Screenshot showing position of Potentially Hazardous Asteroid (153201) 2000 WO107 at Earth close approach on 2020-Nov-29 05:08 UT and trajectory from SPICE SPK-ID: 2153201.

Potentially Hazardous Asteroid (153201) 2000 WO107 will pass by Earth on November 29, 2020 at 11.19 lunar distances. It is brightening and its sky motion is rising rapidly, on November 26, 2020 at magnitude 17.6 moving at 20.03 “/min, brightening to magnitude 13.7 at closest approach on November 29, 2020 05:08 UT moving at 71.29 “/min, and reaching peak magnitude 13.2 on December 1, 2020 with sky motion 39.88 “/min.

(153201) 2000 WO107 is on the schedule for observations by Goldstone Radar Observatory between November 27, 2020 and December 1, 2020.

(153201) 2000 WO107 was discovered at magnitude 15.8 about 20 years ago, on November 29, 2000 by 704 Lincoln Laboratory ETS, New Mexico or LINEAR at Socorro, New Mexico (MPEC 2000-X08).

(153201) 2000 WO107 is one of 12 Near Earth Asteroids (NEAs) with the largest predicted Yarkovsky drift rates, da/dt = 23.45 ± 10.14 10−4 AU/Myr (Nugent et al. 2012). The Yarkovsky effect is a non-gravitational force that perturbs the orbits of small bodies, including near-Earth asteroids (NEAs). Researchers believe that the Yarkovsky effect is a key mechanism in the process that perturbs the orbits of asteroids in the main belt to near-Earth space.

Diameter estimates are made using an albedo. Spectral class X objects in general could be E, M, or P class, where E-class objects are optically bright, M-class objects are metallic, and P-class are optically dark.

The JPL Small Body Database gives a geometric albedo of 0.129 and diameter of 510 meters and specifies it is Class-X from Binzel et al. (2004) Icarus 170, 259-294 derived from NASA NEOWISE infrared observations. This diameter is 25 times the size of the Chelyabinsk object. It falls within the range of 370 to 820 meters assuming an albedo range of 0.25 to 0.05 as the CNEOS NEO Earth Close Approach Tables show.

Perihelion distance q = 0.200 au
Near-Earth asteroids (NEAs) have q < 1.3 au, thus, (153201) 2000 WO107 is a NEA.

Semimajor axis = 0.911 au
Aphelion distance Q = 1.623
Objects with these parameters are called Atens or Near-Earth asteroids with orbits similar to that of 2062 Aten (a < 1.0 au; Q > 0.983 au),

Absolute magnitude H = 19.3
Earth MOID = 0.0031 au
(153201) 2000 WO107 is classified as a Potentially Hazardous Asteroids (PHA) or NEA whose Minimum Orbit Intersection Distance (MOID) with the Earth is 0.05 AU or less and whose absolute magnitude (H) is 22.0 or brighter. i.e. MOID <= 0.05 AU, H <= 22.0

0.05 AU = 7479893.53455 km = 19.45 LD or ~ 5 Earth Hill sphere radii

1 Lunar Distance (LD) = 3.844 × 105 km = 384400 km = 0.00257 AU = 238900 miles = the mean distance from the Earth to the Moon

With a short perihelion distance of 0.2 au and aphelion distance of 1.6 au, (153201) 2000 WO107 makes close approaches to Mercury, Venus, Earth, and Mars. This is illustrated by the orbit trajectory using SPICE SPK-ID: 2153201 and SPICE-enhanced Cosmographia Mission Visualization Tool provided by NAIF. The nominal orbital period is currently 0.87 years.

References:
MPEC 2000-X08 : 2000 WO107 (Dec 2000)
MPEC MPEC 2001-V58 : 2000 WO107 (Nov 2001)
Nugent, C. R.; Mainzer, A.; Masiero, J.; Grav, T.; Bauer, J.; The Yarkovsky Drift’s Influence on NEAs: Trends and Predictions with NEOWISE Measurements, The Astronomical Journal, Volume 144, Issue 3, article id. 75 (September 2012), DOI: 10.1088/0004-6256/144/3/75
SPICE-enhanced Cosmographia Mission Visualization Tool: https://naif.jpl.nasa.gov/naif/cosmographia.html
JPL Small Body database:  https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=153201
MPC database: https://minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=153201






Published by Charles Bell

The observer at MPC Observatory H47 near Vicksburg, Mississippi, USA

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