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Asteroids with Satellites Database--Johnston's Archive

(4288) Tokyotech

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:2.628454679 AU
orbital periodP:4.261384675 yr
(= 1556.500149 d)
eccentricitye:0.176082315
perihelion distanceq:2.1656303 AU
aphelion distanceQ:3.091279063 AU
inclinationi:14.025503°
argument of perihelionω:325.381242°
ascending nodeΩ:44.586688°
mean anomalyM:341.053994°
perihelion passageTP:2019 Jul 17.915170
Epoch:2019 Apr 27
data arc:1959-2019(2017 obs.)
Earth MOID:1.181 AU
Jupiter Tisserand invariantTJ:3.337

orbital data, secondary:

semimajor axisas:30 km[*E]
separation/primary radiusas/rp:5.1 [*E]
separation/Hill radiusas/rH:0.015 [*E]
orbital periodPs:1.2615d [A19a]
eccentricityes:?
normalized ang. mom.αL:?
other data, system (combined):
absolute mag.H:11.6[MPC]
slope parameterG:(0.15) [*A]
effective diameterdE:12.30± 0.09 km [M14c]
geometric albedo:0.223± 0.022[M14c]
color indexU-B:?
color indexB-V:?
taxonomic type:?
massm:?
densityρ:(1.6 g/cm3) [*A]
Hill radiusrH:2000 km [*E]

other data, primary:

diameterdp:11.78± 0.09 km [*D]
rotation periodRPp:3.18± 0.0002h [A19a]
amplitude in mag., rotationalΔM:0.18 [A19a]
amplitude in mag., mutual eventsΔM:0.15 [A19a]
pole directionΒ, λ:?,?

other data, secondary:

diameterds:>3.53km [*D]
diameter ratiods/dp:>0.30 [A19a]
component mag. differenceΔM:<2.6 [*D]
rotation periodRPs:30.26± 0.01h [A19a]

--(4288) Tokyotech --discovery and notes:

Primary discovered1989 Oct 08from Chiyodaby T. Kojima.Alternate designation(s):1989 TQ1, 1951 XD1, 1959 SJ, 1962 JG, 1980 NU, 1983 EQ3, 1983 HA2, A921 XA.Linked to prediscovery observations from 1951.Permanent number assigned 1989 Dec 12.

Named 2008 Aug 19 for the Tokyo Institute of Technology [MPC063639].

Companion discovered2019 Oct 31 by D. Augustin, R. Behrend, M. Deldem, D. Starkey, J. M. Bosch, F. Soldan, J. Delgado, R. G. Farfan, and R. Montaigutusinglightcurve observations from Fregenal de la Sierra, Spain; Pichasca, Chile; Geneva Observatory; Les Barres Observatory, Lamanon, France; DeKalb Observatory, Auburn, Indiana, USA; Amanecer Arrakis Observatory, Seville, Spain; Nuevos Horizontes Observatory, Seville, Spain; Uraniborg Observatory, Sevilla, Spain; OPERA Observatory, Saint Palais, France.Announced2019 Dec 17 [A19a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

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