Asteroids with Satellites Database--Johnston's Archive

(88611) Teharonhiawako and Sawiskera

compiled by Wm. Robert Johnston
last updated 11 May 2014
under construction--testing upgrades!

--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: 43.894 AU
orbital period P: 290.816 yr (= 106220.7 d)
eccentricity e: 0.029879
perihelion distance q: 42.583 AU
aphelion distance Q: 45.206 AU
inclination i: 2.58688°
argument of perihelion ω: 233.57°
ascending node Ω: 304.8357°
mean anomaly M: 159.46°
perihelion passage TP: 1885 Jul 28
Epoch: 2014 May 23
data arc: 2000-2012 (63 obs.)
Earth MOID: 41.5878 AU
Jupiter Tisserand invariant TJ: 5.919
Neptune Tisserand invariant TN:3.10 [*D]


orbital data, secondary:
semimajor axis as: 27670 ± 120 km [G11a]
separation/primary radius as/rp:310 [*D]
separation/Hill radius as/rH:0.059 [*D]
orbital period Ps: 828.76 ± 0.22 d [G11a]
eccentricity es: 0.2494 ± 0.0021 [G11a]
inclination is:144.42°± 0.35 [G11a]
ascending node Ωs:54.22°± 0.69 [G11a]
argument of pericenter ωs:20.1°± 1 [G11a]
mean anomaly M:296.2°± 1.1 [G11a]
Epoch:2001 Mar 31.5
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.8 [MPC]
6.00 ± 0.13 [V14a]
slope parameter G: 0.15 [*A]
effective diameter dE: 220 ± 41/44 km [V14a]
geometric albedo: 0.145 ± 0.086/0.045 [V14a]
color index U-B: ?
color index B-V: 1.01 [O03b]
color index V-R:0.61± 0.04 [O03b]
color index B-R:1.62 [O03b]
color index V-I:1.25 [O03b]
taxonomic type: ?
mass m: 2.44x1018 ± 3.2x1016 kg [G11a]
density ρ: 0.6 ± 0.36/0.33 g/cm3 [V14a]
Hill radius rH: 470000 km [*D]

other data, primary:
diameter dp: 178 ± 33/36 km [V14a]
color index V-I:0.82± 0.04 [B08d]
rotation period RPp: 9.505 ± 0.001 h [O03b]
amplitude in mag., rotational ΔM: 0.6 [O03b]
pole direction : ? ; ?


other data, secondary:
diameter ds: 129 ± 24/26 km [V14a]
diameter ratio ds/dp: 0.724 ± 0.067 [N08c]
component mag. difference ΔM: 0.8 [O03b]
color index B-R:1.61 [O03b]
color index V-I:0.81± 0.05 [B08d]
rotation period RPs: 5.50 ± 0.02 h [*K06a]

-- (88611) Teharonhiawako and Sawiskera --discovery and notes:

Primary discovered 2001 Aug 20 from Cerro Tololo Observatory, La Serena, Chile by Deep Ecliptic Survey. Alternate designation(s): 2001 QT297 . Linked to prediscovery observations from 2000 Aug 01. Permanent number assigned 2004 Aug 30.

Named 2007 Apr 02 for the mythological Iroquois farmer [MPC59388].

Companion discovered 2001 Oct 11 using IMG observations. Announced 2001 Oct 15. Permanent designation I Sawiskera, assigned 2007 Apr 02; named for the mythological Iroquois hunter [*].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2001-2012, 2014 by Wm. Robert Johnston.
Last modified 11 May 2014.
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