Sila-Nunam (79360 1997 CS29)

System parameters

Heliocentric orbitPhotometry Position 2016/03/19 04:56 UT
DES class = CLASSICAL HV = 5.50±0.02 +09:18:09.15 +15:08:36.4
<a> = 43.91 (AU) V = 21.9 (V2 = 22.7) Uncertainty = 0.1 (arcsec)
<e> = 0.013 Δmag = 0.12 Rates: -2.157, +0.640 ("/hr)
<i> = 3.84 (degrees) B-V = 1.13±0.04  
Perihelion = 2040 V-R = 0.65±0.02 Opposition: February
Aphelion = 2186    

Additional links

Astrometric observations

Observation time (UT)Observatory/InstrumentRADEC Δ (AU)Δx (arcsec) Δx errorΔy (arcsec) Δy error
2001/11/01  02.61998 HST/STIS +08:14:21.81 +20:01:53.8 43.44068 +0.03487 0.00389 -0.05733 0.00330
2001/11/04  14.03494 HST/STIS +08:14:21.36 +20:01:54.4 43.38150 -0.01860 0.00281 +0.07067 0.00269
2002/10/22  23.67232 HST/NICMOS-NIC2 +08:19:27.26 +19:42:25.8 43.61672 -0.03033 0.00439 +0.06795 0.00212
2005/11/30  12.41760 HST/ACS-HRC +08:34:32.34 +18:40:37.3 43.01220 +0.00635 0.00191 +0.01181 0.00123
2007/10/09  21.36861 HST/WFPC2-PC +08:44:25.10 +17:57:55.9 43.89975 -0.02058 0.00154 +0.08526 0.00140
2007/10/10  02.23528 HST/WFPC2-PC +08:44:25.67 +17:57:53.6 43.89651 -0.02256 0.00240 +0.08415 0.00128
2007/10/11  16.53111 HST/WFPC2-PC +08:44:30.06 +17:57:35.5 43.87083 -0.01988 0.00112 +0.04933 0.00172
2007/11/22  10.55195 HST/WFPC2-PC +08:45:01.50 +17:55:05.2 43.16435 +0.02516 0.00100 -0.08196 0.00158
2007/12/23  13.92417 HST/WFPC2-PC +08:43:42.21 +17:59:50.8 42.73706 -0.02298 0.00100 +0.08506 0.00100
2010/02/27  17.15972 HST/WFC3-UVIS +08:48:56.71 +17:32:31.1 42.63802 +0.01344 0.00443 -0.02548 0.00246
2010/02/28  16.74861 HST/WFC3-UVIS +08:48:52.66 +17:32:46.8 42.64617 +0.00897 0.01039 +0.00720 0.00495
2010/04/03  16.00958 HST/WFC3-UVIS +08:47:11.39 +17:39:18.3 43.06215 +0.02373 0.00145 -0.08635 0.00134
2010/04/26  18.16135 HST/WFC3-UVIS +08:46:57.19 +17:40:10.4 43.43977 +0.00465 0.00380 -0.04546 0.00221
2010/05/28  18.76576 HST/WFC3-UVIS +08:47:57.90 +17:36:06.6 43.96517 -0.00822 0.00318 +0.06768 0.00254
2012/03/01  04.09224 GROUND-BASED/MUTUAL EVENT +08:59:01.97 +16:45:06.5 42.62254 +0.00000 0.00786 +0.00000 0.00012
2013/01/20  09.83040 GROUND-BASED/MUTUAL EVENT +09:07:12.96 +16:07:16.8 42.53754 +0.00000 0.00788 +0.00000 0.00020
2013/02/08  03.84000 GROUND-BASED/MUTUAL EVENT +09:05:43.94 +16:13:33.5 42.50981 +0.00000 0.00788 +0.00000 0.00009
2013/02/14  10.55760 GROUND-BASED/MUTUAL EVENT +09:05:14.24 +16:15:39.4 42.52474 +0.00000 0.00788 +0.00000 0.00003
2013/03/05  04.54464 GROUND-BASED/MUTUAL EVENT +09:03:52.12 +16:21:27.7 42.63835 +0.00000 0.00786 +0.00000 0.00011
2013/03/11  11.29440 GROUND-BASED/MUTUAL EVENT +09:03:28.12 +16:23:09.5 42.69776 +0.00000 0.00785 +0.00000 0.00017

Orbital knowledge

Comments: Orbit from astrometric observations published here. Including constraints from subsequent mutual events leads to this new, improved orbit, published by Benecchi et al. Icarus 2014.
Parameter Value Units
P period12.51006±0.00002days
a semimajor axis2770±10kilometers
e eccentricity0.026±0.006dimensionless
i inclination103.7±0.3degrees
ε mean longitude at epoch16.9±0.2degrees
Ω longitude of ascending node140.6±0.2degrees
ϖ longitude of periapsis343±5degrees

Angles are referenced to J2000 equatorial coordinates.

Epoch = Julian date 2454400.0

2016/03/19 04:56


Last updated: 2016/03/19 04:56 UT