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Asteroids with Satellites Database--Johnston's Archive
(2478) Tokai
compiled by Wm. Robert Johnston
last updated21 September 2014--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: | 2.225290189 AU | | orbital periodP: | 3.319618544 yr
(= 1212.4906730 d) | | eccentricitye: | 0.068326263 | | perihelion distanceq: | 2.073244426 AU | | aphelion distanceQ: | 2.377335952 AU | | inclinationi: | 4.1377104° | | argument of perihelionω: | 233.299096° | | ascending nodeΩ: | 228.827934° | | mean anomalyM: | 107.605718° | | perihelion passageTP: | 2013 May 25.5807 | | Epoch: | 2014 May 23 | | data arc: | 1932-2014(1353 obs.) | | Earth MOID: | 1.09268 AU | | Jupiter Tisserand invariantTJ: | 3.64 |
orbital data, secondary: | semimajor axisas: | 21 km[*E] | | separation/primary radiusas/rp: | 5.2 [*E] | | separation/Hill radiusas/rH: | 0.014 [*E] | | orbital periodPs: | 1.079± 0.00029d [H07c] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 12[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 9.98± 0.03 km [M11b] | | geometric albedo: | 0.208± 0.037[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | S (SMASSII) [JPL] | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 1500 km [*E] |
other data, primary: | diameterdp: | 8.1± 0.02 km [*D] | | rotation periodRPp: | 25.885± 0.007h [H07c] | | amplitude in mag., rotationalΔM: | 0.41 [H07c] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 5.83km [*D] | | diameter ratiods/dp: | >0.72 [H07c] | | component mag. differenceΔM: | <0.71 [*D] | | rotation periodRPs: | 25.885± 0.007h [H07c] | |
|
--(2478) Tokai --discovery and notes:
Primary discovered1981 May 04from Tokai, Japanby T. Furuta.Alternate designation(s):1981 JC, 1931 HH, 1932 SE, 1934 ED, 1939 VH, 1951 JP, 1955 OE, 1955 QV, 1957 BD, 1972 RS, 1978 NU2, 1979 XR, 1981 JT.Linked to prediscovery observations from 1932 Sep 30.Permanent number assigned 1981 Nov 11.
Named 1982 Feb 08 for the city of Tokai, Aichi, Japan [MPC6650].
Companion discovered2007 Jan 20 by D. Higgins, P. Pravec, P. Kusnirak, B. Warner, A. Galad, J. Oey, R. Gonclaves, W. Cooney, J. Gross, and D. Terrellusinglightcurve observations from Canberra, Australia; Ondrejov Observatory, Czech Republic; Palmer Divide Observatory, Colorado Springs, Colorado; Modra Observatory, Slovakia; Leura, NSW, Australia; Linhaceira, Tomar, Portugal; Sonoita Research Observatory, Sonoita, Arizona, USA.Announced2007 Jan 30 [H07c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Higgins, D., Pravec, P., Kusnirak, P., Warner, B., Galad, A., Oey, J., Goncalves, R., Cooney, W., Gross, J., & Terrell, D. 2007, Central Bureau Electronic Telegrams(2478) Tokai
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System2478 Tokai CCD Spectrum
©2007-2009, 2014by Wm. Robert Johnston.
Last modified21 September 2014.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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