1999 OJ4

System parameters

Heliocentric orbitPhotometry Position 2022/03/21 22:19 UTC
DES class = CLASSICAL HV = 7.35±0.02 +23:27:22.95 -06:22:15.2
<a> = 38.09 (AU) V = 23.1 (V2 = 23.9) Uncertainty = 3.0 (arcsec)
<e> = 0.018 Δmag = 0.09 Rates: +4.126, +1.679 ("/hr)
<i> = 2.59 (degrees) B-V = NULL  
Perihelion = 2057 V-R = NULL Opposition: September
Aphelion = 2175    

Astrometric observations

Observation time (UTC)Observatory/InstrumentRADEC Δ (AU)Δx (arcsec) Δx errorΔy (arcsec) Δy error
2002/10/04  14.35910 HST/NICMOS-NIC2 +21:24:55.73 -16:05:38.2 37.55838 -0.03528 0.00416 +0.07056 0.01008
2005/07/24  16.98776 HST/ACS-HRC +21:49:08.21 -14:25:27.7 37.15639 +0.09392 0.00056 +0.03652 0.00057
2007/07/05  23.30583 HST/WFPC2-PC +22:02:41.41 -13:26:19.5 37.32587 -0.01522 0.00222 -0.14436 0.00127
2007/07/07  10.59333 HST/WFPC2-PC +22:02:36.58 -13:26:49.5 37.30862 -0.02094 0.00165 -0.14481 0.00100
2007/07/12  21.10167 HST/WFPC2-PC +22:02:17.38 -13:28:47.3 37.24887 -0.05148 0.00281 -0.13556 0.00100
2007/08/01  22.20167 HST/WFPC2-PC +22:00:51.66 -13:37:12.1 37.09062 -0.07347 0.00233 +0.00338 0.00446
2007/08/24  09.42055 HST/WFPC2-PC +21:58:59.80 -13:47:41.0 37.04478 +0.10699 0.00247 +0.00925 0.00137
2012/08/06  12.01528 GEMINI/NIRI +23:04:11.93 +19:40:43.6 43.61963 -0.04287 0.05000 -0.08995 0.05000
2013/10/25  05.51688 Keck/NIRC2 +22:31:48.59 -11:22:24.8 37.32424 -0.03725 0.00100 +0.05050 0.00100
2015/09/05  11.96080 Keck/NIRC2 +22:47:39.58 -10:01:26.9 36.80695 +0.04715 0.00256 +0.07722 0.00312

Orbital knowledge

Comments: Orbit published here, and updated here.
Parameter Value Units
P period84.115±0.005days
a semimajor axis3310±20kilometers
e eccentricity0.368±0.004dimensionless
i inclination53.6±0.7degrees
ε mean longitude at epoch37.5±0.9degrees
Ω longitude of ascending node276±1degrees
ϖ longitude of periapsis330.2±0.6degrees

Angles are referenced to J2000 equatorial coordinates.

Epoch = Julian date 2454000.0

2022/03/21 22:19


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