2006 JZ81

compiled by Wm. Robert Johnston
last updated 15 August 2011

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: 44.53312 AU
orbital period P: 297.19 y (=108,548.2 d)
eccentricity e: 0.077029
perihelion distance q: 41.10280 AU
aphelion distance Q: 47.96345 AU
inclination i: 3.5566°
argument of perihelion omega: 182.0859°
ascending node OMEGA: 36.3986°
mean anomaly M: 2.6510°
perihelion passage TP: 2009-06-18.6
Epoch: 27 AUG 2011
data arc: 2004-2011 (26 obs.)

orbital data, secondary:
semimajor axis a: 32,300 +5,300/-2,800 km [P11a]
semimajor axis/primary radius a/Rp: (530)
orbital period P: 4.11 +0.15/-0.12 yr [P11a]
eccentricity e: 0.84 +0.03/-0.02 [P11a]
inclination to ecliptic i: 13.3° +2.5°/-1.9° [P11a]
argument of perihelion omega: 171° ± 2° [P11a]
ascending node OMEGA: 82° +5°/-7° [P11a]
mean anomaly M: 104° +9°/-8° [P11a]
epoch: JD 2455007.86 [P11a]

other data, primary:
diameter: 122 +20/-12 km [P11a]
absolute magnitude H: 6.7 [JPL]
rotation period: ?
amplitude delta M: ?
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: 0.17 +0.07/-0.06 [P11a]
mass: (1.183 +0.709/-0.318)x1018 kg [P11a]
density: (1 g cm-3) [a]
type: ?

other data, secondary:
diameter: (78 km)
diameter ratio Ds/Dp: (0.64)
component magnitude difference: 0.98 ± 0.02 [P11a]
rotation period: ?

----discovery and notes:

Primary discovered 1 May 2006 from Mauna Kea. Linked to precovery observations from 2004.

Companion discovered 2006; reported 11 August 2011.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2011 by Wm. Robert Johnston.
Last modified 15 August 2011.
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