(47171) 1999 TC36 and S/2001 (47171) 1

compiled by Wm. Robert Johnston
last updated 4 March 2006

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 39.2280453217444 AU
orbital period P: 245.6989 y (=89743 d)
eccentricity e: 0.221336017210763
perihelion distance q: 30.5454660072662 AU
aphelion distance Q: 47.91062464 AU
inclination i: 8.41541631958719°
argument of perihelion omega: 295.351141968415°
ascending node OMEGA: 97.1231020762021°
mean anomaly M: 344.706976754838°
perihelion passage TP: 2015-07-09.2754936
Epoch: 30 JAN 2005
data arc: 1999-2003 (85 obs.)

orbital data, secondary:
semimajor axis a: 7,640 ± 460 km [M04b]
7,720 km [S06a]
semimajor axis/primary radius a/Rp: (40)
orbital period P: 50.38 ± 0.5 d [M04b]
eccentricity e: ?

other data, primary:
diameter: 379 (± 61/51) km [S06a]
absolute magnitude H: 4.73 [JPL]
rotation period: >8 h? [P02b]
6.21 h? [O03b]
amplitude delta M: <0.07 [L06a]
0.06? [O03b]
color index B-V: 1.01 ± 0.04 [B05c]
color index V-R: 0.69 ± 0.03 [B05c]
color index R-I: 0.63 ± 0.05 [B05c]
color index V-J: 2.32 ± 0.07 [M03a]
color index V-H: 2.74 ± 0.03 [B05c]
slope parameter G: (0.15) [a]
geometric albedo: 0.079 ±0.031/0.024 [S06a]
mass (system): (1.39 ± 0.25)x1019 kg [M04b]
(1.44 ± 0.22)x1019 kg [S06a]
density: 0.5 ± 0.3/0.2 g/cm3 [S06a]
type: P [M03a]
BBFB type: RR [B05c]

other data, secondary:
diameter: 142 (± 23/19) km [S06a]
diameter ratio Ds/Dp: (0.374 ± 0.004) [M05b]
component magnitude difference: (2.14) [M05b]
rotation period: ?

--(47171) 1999 TC36--discovery and notes:

Primary discovered 1 October 1999 by E. P. Rubenstein and L.-G. Strolger from Kitt Peak, Arizona, USA.

Companion discovered from 8 December 2001 observations by C. A. Trujillo and M. E. Brown using the Hubble Space Telescope; announced 10 January 2002.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2003-2005, 2006 by Wm. Robert Johnston.
Last modified 4 March 2006.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.