(2478) Tokai
compiled by Wm. Robert Johnston
last updated 13 January 2009
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: |
(~20 km?)
| |
semimajor axis/primary radius a/Rp: |
(6?)
| |
orbital period P: |
25.885 ± 0.007 h [C824]
25.891 [PAa]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
~8 km [PAa]
| |
absolute magnitude H: |
12.8 [JPL]
| |
rotation period: |
25.885 ± 0.007 h [C824]
25.891 [PAa]
| |
amplitude delta M: |
0.8 ± 0.02 [HHa]
0.41 [C824]
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) assumed
| |
geometric albedo: |
(0.16) assumed
| |
mass: |
?
| |
density: |
?
| |
type: |
S [JPL]
|
other data, secondary:
|
diameter: |
~7 km [PAa]
| |
diameter ratio Ds/Dp: |
0.86 [PAa]
>=0.72 [C824]
| |
component magnitude difference: |
(0.3)
| |
rotation period: |
25.885 ± 0.007 h [C824]
25.891 [PAa]
|
|
--(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 D. Higgins, P. Pravec, P. Kusnirak, B. Warner, A. Galad, J. Oey, R. Goncalves, W. Cooney, J. Gross, and D. Terrell based on lightcurve observations obtained 20-28 January 2007, 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:
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System, EAR-A-I0028-4-SBN0001/SMASSII-V1.0:2478TOKAI01 2478 Tokai CCD Spectrum
© 2007-2008, 2009 by Wm. Robert Johnston.
Last modified 13 January 2009.
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