Eris (136199 2003 UB313)

System parameters

Heliocentric orbitPhotometry Position 2018/06/25 14:21 UTC
DES class = SCATNEAR HV = -1.158±0.003 +01:45:41.24 -01:56:05.8
<a> = 67.93 (AU) V = 18.7 (V2 = 25.4) Uncertainty = 0.0 (arcsec)
<e> = 0.447 Δmag = 6.70 Rates: +0.644, +0.022 ("/hr)
<i> = 43.22 (degrees) B-V = 0.75±0.03  
Perihelion = 2258 V-R = 0.394±0.008 Opposition: October
Aphelion = 1979    

Astrometric observations

Observation time (UTC)Observatory/InstrumentRADEC Δ (AU)Δx (arcsec) Δx errorΔy (arcsec) Δy error
2005/09/10  12.48000 HST/ACS-HRC +01:38:37.16 -05:28:04.6 96.08486 -0.52000 0.00800 +0.08000 0.00800
2005/12/03  10.56000 HST/ACS-HRC +01:35:46.90 -05:40:08.7 96.29267 +0.20600 0.00600 -0.33800 0.00600
2006/08/20  14.88000 HST/ACS-HRC +01:39:37.26 -05:08:01.3 96.27433 -0.14800 0.01000 +0.34800 0.01000
2006/08/21  14.16000 HST/ACS-HRC +01:39:36.18 -05:08:13.3 96.26150 -0.36000 0.04000 +0.26000 0.04000
2006/08/30  13.92000 HST/ACS-HRC +01:39:24.72 -05:10:08.8 96.15075 +0.48800 0.02000 -0.20000 0.02000
2006/08/30  20.88000 HST/ACS-HRC +01:39:24.31 -05:10:12.6 96.14744 +0.50400 0.00100 -0.16700 0.00100
2006/08/31  12.00000 HST/ACS-HRC +01:39:23.41 -05:10:20.9 96.14030 +0.52000 0.01000 -0.07200 0.01000
2007/08/13  02.04194 HST/WFPC2-PC +01:40:14.69 -04:51:04.0 96.33378 +0.48467 0.00415 -0.17810 0.00268
2015/01/29  04.86295 HST/WFC3 +01:39:47.39 -03:14:05.4 96.63267 -0.34694 0.00202 -0.22755 0.00134
2015/02/01  10.87726 HST/WFC3 +01:39:49.36 -03:13:19.9 96.68466 +0.29135 0.00262 -0.32538 0.00111

Orbital knowledge

Comments: Orbit published here and updated here. This solution folds in more recent (2015) observations.
Parameter Value Units
P period15.78564±0.00008days
a semimajor axis37400±100kilometers
e eccentricity0.010±0.003dimensionless
i inclination45.8±0.4degrees
ε mean longitude at epoch125.2±0.5degrees
Ω longitude of ascending node126.3±0.4degrees
ϖ longitude of periapsis10±20degrees

Angles are referenced to J2000 equatorial coordinates.

Epoch = Julian date 2453979.0

2018/06/25 14:21


Last updated: 2018/06/25 14:21 UTC