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Asteroids with Satellites Database--Johnston's Archive
(8026) Johnmckay
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, Hungaria
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 1.925339521 AU | | orbital periodP: | 2.671586196 yr
(= 975.7968581 d) | | eccentricitye: | 0.07492829 | | perihelion distanceq: | 1.78107713 AU | | aphelion distanceQ: | 2.069601917 AU | | inclinationi: | 19.932288° | | argument of perihelionω: | 145.807757° | | ascending nodeΩ: | 217.736260° | | mean anomalyM: | 98.495429° | | perihelion passageTP: | 2013 Aug 29.0235 | | Epoch: | 2014 May 23 | | data arc: | 1989-2014(659 obs.) | | Earth MOID: | 0.7992 AU | | Jupiter Tisserand invariantTJ: | 3.843 |
orbital data, secondary: | semimajor axisas: | ? | | orbital periodPs: | ? | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 14.8[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 1.69± 0.24 km [M11b] | | geometric albedo: | 0.815± 0.196[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 230 km [*E] |
other data, primary: | diameterdp: | 1.69± 0.24 km [M11b] | | rotation periodRPp: | 372± 5h [W11a] | | amplitude in mag., rotationalΔM: | 0.12 [W10e] | | amplitude in mag., mutual eventsΔM: | 0.40 [W10e] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | ? | | diameter ratiods/dp: | ? | | component mag. differenceΔM: | ? | | rotation periodRPs: | 2.300± 0.001h [W10e] | |
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--(8026) Johnmckay --discovery and notes:
Primary discovered1991 May 08from Palomar Observatory, California, USAby E. F. Helin.Alternate designation(s):1991 JA1, 1989 UF2.Linked to prediscovery observations from 1989 Oct 27.Permanent number assigned 1997 Nov 14.
Named 2012 Mar 08 for John McKay (1922-1975) [MPC78269].
Companion discovered2010 Jul 11usinglightcurve observations.Announced2010 Aug 06.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©2010-2013, 2014by Wm. Robert Johnston.
Last modified21 September 2014.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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