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Asteroids with Satellites Database--Johnston's Archive

(5500) Twilley

compiled by Wm. Robert Johnston
last updated30 April 2022

--Orbital and physical data--

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

dynamical type, primary:main belt asteroid

orbital data, primary (osculating elements)[JPL]:

semimajor axisa:2.2796606587 AU
orbital periodP:3.4419559399 yr
(= 1257.1981508 d)
eccentricitye:0.089623438
perihelion distanceq:2.075349633 AU
aphelion distanceQ:2.4839716843 AU
inclinationi:4.3972559°
argument of perihelionω:341.244747°
ascending nodeΩ:112.51406°
mean anomalyM:279.425161°
perihelion passageTP:2020 Feb 02.384828
Epoch:2019 Apr 27
data arc:1955-2019(1940 obs.)
Earth MOID:1.09272 AU
Jupiter Tisserand invariantTJ:3.597

orbital data, secondary:

semimajor axisas:7.8 km[*E]
separation/primary radiusas/rp:3.6 [*E]
separation/Hill radiusas/rH:0.011 [*E]
orbital periodPs:0.7315± 0.0003d [C19a]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:13.6[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:4.48± 0.12 km [M11b]
geometric albedo:0.350± 0.056[M11b]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:700 km [*E]

other data, primary:

diameterdp:4.33 km [*D]
rotation periodRPp:2.9554± 0.0002h [C19a]
amplitude in mag., rotationalΔM:0.15 [C19a]
amplitude in mag., mutual eventsΔM:0.105 ±0.025 [C19a]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:>1.17km [*D]
diameter ratiods/dp:>0.27 [C19a]
component mag. differenceΔM:<2.8 [*D]
rotation periodRPs:?

--(5500) Twilley --discovery and notes:

Primary discovered1981 Nov 24from Anderson Mesa, Flagstaff, Arizona, USAby E. Bowell.Alternate designation(s):1981 WR, 1974 VU2, 1988 XV.Linked to prediscovery observations from 1955 Mar 23.Permanent number assigned 1993 Apr 06.

Named 1995 Nov 07 for Royston C. Twilley (1914-) [MPC025976].

Companion discovered2017 Feb by M. Conjat, R. Montaigut, D. Augustin, C. Pinturaud, R. Behrend, P. Griveaud, D. mata, and J.-P. Rivetusinglightcurve observations from Nice Observatory, France; Club d’Astronomie de Lyon Ampere, France; Pichasca, Chile; Haute-Provence Observatory; Geneva Observatory, Switzerland; Calern Observatory, France.Announced2019 Dec 20 [C19a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

©2019, 2022by Wm. Robert Johnston.
Last modified30 April 2022.
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