(2478) Tokai

compiled by Wm. Robert Johnston
last updated 4 February 2007

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: 2.2253577 AU
orbital period P: 3.32 y (=1,212.55 d)
eccentricity e: 0.0680288
perihelion distance q: 2.0739693 AU
aphelion distance Q: 2.3767461 AU
inclination i: 4.14012°
argument of perihelion omega: 232.94453°
ascending node OMEGA: 228.92121°
mean anomaly M: 56.12093°
perihelion passage TP: 2006-10-02.974
Epoch: 10 APR 2007
data arc: 1932-1998 (60 obs.)

orbital data, secondary:
semimajor axis a: ?
semimajor axis/primary radius a/Rp: ?
orbital period P: ?
eccentricity e: ?

other data, primary:
diameter: (10 km?)
absolute magnitude H: 12.8 [JPL]
rotation period: ?
amplitude delta M: ?
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) [a]
geometric albedo: ?
mass: ?
density: ?
type: S [JPL]

other data, secondary:
diameter: ?
diameter ratio Ds/Dp: ?
component magnitude difference: ?
rotation period: ?

--(2478) Tokai--discovery and notes:

Primary discovered 4 May 1981 by T. Furuta from Tokai, linked to observations from 1931. Alternate designations 1981 JC, 1981 JT, 1979 XR, 1978 NU2, 1972 RS, 1957 BD, 1955 QV, 1955 OE, 1951 JP, 1939 VH, 1934 ED, 1932 SE, 1931 HH.

Companion discovered by Ondrejov NEO Photometric Program based on lightcurve observations, announced 30 January 2007.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2007 by Wm. Robert Johnston.
Last modified 4 February 2007.
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