Asteroids with Satellites Database--Johnston's Archive

(66652) Borasisi and Pabu

compiled by Wm. Robert Johnston
last updated 20 September 2014

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: TNO, Cubewano


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.616 AU
orbital period P: 288.058 yr
(= 105213.1 d)
eccentricity e: 0.08462
perihelion distance q: 39.9254 AU
aphelion distance Q: 47.307 AU
inclination i: 0.562939°
argument of perihelion ω: 196.692°
ascending node Ω: 84.588°
mean anomaly M: 56.624°
perihelion passage TP: 1969 Jan 30
Epoch: 2014 May 23
data arc: 1999-2012 (51 obs.)
Earth MOID: 38.9085 AU
Jupiter Tisserand invariant TJ: 5.889
Neptune Tisserand invariant TN:3.09 [*D]


orbital data, secondary:
semimajor axis as: 4528 ± 12 km [G11a]
separation/primary radius as/rp:72 [*D]
separation/Hill radius as/rH:0.0091 [*D]
orbital period Ps: 46.2888 ± 0.0018 d [G11a]
eccentricity es: 0.4700 ± 0.0018 [G11a]
inclination is:54.31° ± 0.03° [G11a]
ascending node Ωs:70.44° ± 0.47° [G11a]
argument of pericenter ωs:238.85° ± 0.66° [G11a]
mean anomaly M:214.4° ± 0.5° [G11a]
Epoch:2000 Dec 21.5
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.9 [MPC]
6.121 ± 0.07 [V14a]
slope parameter G: (0.15) [*A]
effective diameter dE: 163 ± 32/66 km [V14a]
geometric albedo: 0.236 ± 0.438/0.077 [V14a]
color index U-B: ?
color index B-V: 0.82 [H02a]
color index V-R:0.646 ± 0.058 [H02a]
color index B-R:1.47 [H02a]
color index V-I:1.3 [D01b]
color index R-J:1.36 [*D]
color index V-J:2.01 ± 0.07 [M03c]
color index J-H:0.49 ± 0.09 [D06a]
color index V-H:2.5 [*D]
taxonomic type: ?
mass m: 3.43x1018 ± 2.7x1016 kg [G11a]
density ρ: 2.1 ± 2.6/1.2 g/cm3[V14a]
Hill radius rH: 500000 km [*D]

other data, primary:
diameter dp: 126 ± 25/51 km [V14a]
rotation period RPp: 6.4 ± 1 h [K06a]
amplitude in mag., rotational ΔM: 0.08 ± 0.02 [K06a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 103 ± 20/42 km [V14a]
diameter ratio ds/dp: 0.817 ± 0.008 [S06c]
component mag. difference ΔM: 0.4 [* D]
rotation period RPs: ?

-- (66652) Borasisi and Pabu --discovery and notes:

Primary discovered 1999 Sep 08 from Mauna Kea Observatory, Hawaii, USA by C. A. Trujillo, J. X. Luu, and D. C. Jewitt. Alternate designation(s): 1999 RZ253 . Permanent number assigned 2003 Sep 10.

Named 2007 Sep 26 for the mythological character in Cat's Cradle [MPC60731].

Companion discovered 2003 Apr 23 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2003 Jun 06. Permanent designation I Pabu, assigned 2007 Sep 26; named for the mythological character in Cat's Cradle [*].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2003-2012, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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