1998 WW31

System parameters

Heliocentric orbitPhotometry Position 2022/03/21 22:19 UTC
DES class = CLASSICAL HV = 6.7±0.5 +05:03:14.64 +20:22:36.3
<a> = 44.71 (AU) V = 23.5 (V2 = 24.4) Uncertainty = 0.2 (arcsec)
<e> = 0.085 Δmag = 0.40 Rates: +1.278, +0.189 ("/hr)
<i> = 8.34 (degrees) B-V = NULL  
Perihelion = 2203 V-R = NULL Opposition: December
Aphelion = 2054    

Astrometric observations

Observation time (UTC)Observatory/InstrumentRADEC Δ (AU)Δx (arcsec) Δx errorΔy (arcsec) Δy error
2001/07/12  21.58352 HST/WFPC2-PC +03:38:13.76 +19:36:01.1 47.35306 +0.48083 0.00236 +0.73929 0.00317
2001/08/09  18.96139 HST/WFPC2-PC +03:39:29.44 +19:39:41.9 46.92780 +0.37245 0.00541 +0.67017 0.00712
2001/09/10  16.40139 HST/WFPC2-PC +03:39:36.27 +19:39:28.0 46.40182 +0.21209 0.00578 +0.54794 0.00287
2001/12/30  11.68380 HST/WFPC2-PC +03:32:50.93 +19:14:07.0 46.06694 +0.41276 0.00570 +0.05951 0.00251
2002/01/19  12.56713 HST/WFPC2-PC +03:32:02.83 +19:10:51.0 46.34970 +0.54044 0.00474 +0.15793 0.00514
2002/02/24  05.52806 HST/WFPC2-PC +03:32:02.48 +19:09:59.3 46.95996 +0.69528 0.00739 +0.31998 0.00391
2002/07/13  02.11903 HST/WFPC2-PC +03:42:47.85 +19:43:12.3 47.43260 +0.90493 0.00609 +0.73299 0.00677
2002/08/14  01.66903 HST/WFPC2-PC +03:44:12.39 +19:47:04.4 46.94311 +0.90133 0.00373 +0.79308 0.00512
2002/09/13  17.23945 HST/WFPC2-PC +03:44:12.88 +19:46:25.6 46.43913 +0.89493 0.00373 +0.83599 0.00499
2002/10/14  11.80264 HST/WFPC2-PC +03:42:56.21 +19:41:36.7 46.03738 +0.85983 0.00431 +0.86517 0.00200
2002/11/13  01.47417 HST/WFPC2-PC +03:40:52.92 +19:34:13.9 45.85983 +0.80549 0.00374 +0.87204 0.00324
2002/12/13  16.63944 HST/WFPC2-PC +03:38:35.53 +19:25:57.3 45.95006 +0.72199 0.00374 +0.86345 0.00200
2003/01/14  20.35102 HST/WFPC2-PC +03:36:51.93 +19:19:27.2 46.31998 +0.61340 0.00529 +0.82855 0.00561
2003/02/13  09.86931 HST/WFPC2-PC +03:36:27.36 +19:17:27.1 46.81001 +0.51199 0.00432 +0.76561 0.00229
2012/11/03  12.51417 Gemini/NIRI +04:28:19.21 +20:25:58.5 46.58880 +0.49868 0.05000 +0.62460 0.05000
2013/10/25  09.63017 Keck 2/NIRC2 +04:33:29.30 +20:29:44.5 46.68958 +0.94313 0.00362 +0.68637 0.00169

Orbital knowledge

Comments: Orbit published here, and updated here.
Parameter Value Units
P period587.3±0.2days
a semimajor axis22620±40kilometers
e eccentricity0.819±0.002dimensionless
i inclination41.4±0.4degrees
ε mean longitude at epoch30.8±0.3degrees
Ω longitude of ascending node94.6±0.7degrees
ϖ longitude of periapsis348.5±0.6degrees

Angles are referenced to J2000 equatorial coordinates.

Epoch = Julian date 2452300.5

2022/03/21 22:19


Last updated: 2022/03/21 22:19 UTC