26308 (1998 SM165)

System parameters

Heliocentric orbitPhotometry Position 2014/09/14 18:58 UT
DES class = 2:1E+6:3EII HV = 6.1±0.1 +02:32:58.78 +06:51:02.2
<a> = 47.80 (AU) V = 22.1 (V2 = 24.9) Uncertainty = 0.5 (arcsec)
<e> = 0.375 Δmag = 2.69 Rates: -1.819, -1.105 ("/hr)
<i> = 13.07 (degrees) B-V = 1.02±0.05  
Perihelion = 1974 V-R = 0.63±0.02 Opposition: November
Aphelion = 2139    

Astrometric observations

Observation time (UT)Observatory/InstrumentRADEC Δ (AU)Δx (arcsec) Δx errorΔy (arcsec) Δy error
2001/12/22  12.83881 HST/STIS +00:58:33.46 +02:52:37.4 34.83040 -0.18912 0.00315 +0.10161 0.00100
2001/12/28  09.90777 HST/STIS +00:58:32.93 +02:52:42.1 34.93584 -0.23783 0.00160 -0.01436 0.00100
2003/06/30  17.76930 HST/ACS-HRC +01:21:20.85 +04:34:13.3 35.76803 -0.23881 0.00050 -0.45425 0.00088
2003/07/09  21.03822 HST/ACS-HRC +01:21:40.40 +04:34:29.8 35.62429 -0.21092 0.00051 -0.54366 0.00124
2003/07/25  19.63302 HST/ACS-HRC +01:21:54.33 +04:32:54.6 35.37240 -0.13195 0.00050 -0.61754 0.00050
2003/08/23  18.22014 HST/ACS-HRC +01:21:14.73 +04:23:46.1 34.96570 +0.06598 0.00074 -0.40888 0.00085
2004/01/28  10.73298 HST/ACS-HRC +01:14:00.15 +03:35:16.0 36.07537 +0.03684 0.00050 +0.22915 0.00050
2006/07/05  22.63950 HST/ACS-HRC +01:42:22.85 +05:22:13.5 36.78095 +0.07224 0.00079 -0.28562 0.00050
2010/01/10  14.77028 HST/WFC3-UVIS +01:54:22.88 +05:06:46.4 37.66306 -0.03151 0.00369 -0.51687 0.00360

Orbital knowledge

Comments: Orbit published here, and updated here.
Parameter Value Units
P period130.158±0.005days
a semimajor axis11377±8kilometers
e eccentricity0.4727±0.0007dimensionless
i inclination81.57±0.05degrees
ε mean longitude at epoch280.5±0.1degrees
Ω longitude of ascending node47.09±0.08degrees
ϖ longitude of periapsis114.9±0.1degrees

Angles are referenced to J2000 equatorial coordinates.

Epoch = Julian date 2452700.0

2014/09/14 18:58


Last updated: 2014/09/14 18:58 UT