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Asteroids with Satellites Database--Johnston's Archive
(26416) 1999 XM84
compiled by Wm. Robert Johnston
last updated29 May 2019--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: | 2.342614127 AU | | orbital periodP: | 3.585511642 yr
(= 1309.632861 d) | | eccentricitye: | 0.051129417 | | perihelion distanceq: | 2.22283763 AU | | aphelion distanceQ: | 2.462390622 AU | | inclinationi: | 4.5276043° | | argument of perihelionω: | 285.714522° | | ascending nodeΩ: | 263.060576° | | mean anomalyM: | 339.185955° | | perihelion passageTP: | 2015 Feb 22.71877 | | Epoch: | 2014 Dec 09 | | data arc: | 1994-2015(967 obs.) | | Earth MOID: | 1.22864 AU | | Jupiter Tisserand invariantTJ: | 3.557 |
orbital data, secondary: | semimajor axisas: | 8.8 km[*E] | | separation/primary radiusas/rp: | 4 [*E] | | separation/Hill radiusas/rH: | 0.011 [*E] | | orbital periodPs: | 0.865± 0.0004d [W17a] | | eccentricityes: | 0[P15f] | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 14.3[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 4.56 km [*E] | | geometric albedo: | (0.16) [*A] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 770 km [*E] |
other data, primary: | diameterdp: | 4.4 km [*E] | | rotation periodRPp: | 2.907± 0.001h [P14a] | | amplitude in mag., rotationalΔM: | 0.2± 0.03 [P14a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.19km [*E] | | diameter ratiods/dp: | 0.27± 0.02 [W17a] | | component mag. differenceΔM: | 2.84± 0.16 [*D] | | rotation periodRPs: | ? | |
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--(26416) 1999 XM84 --discovery and notes:
Primary discovered1999 Dec 07from Socorro, New Mexico, USAby LINEAR Program.Alternate designation(s): 1994 NL12, 1999 XL95.Linked to prediscovery observations from 1994 Jul 08.Permanent number assigned 2001 Jul 05.
Companion discovered2014 by P. Pravec, P. Kusnirak, K. Nornoch, A. Galad, and J. Zizkausinglightcurve observations.Announced2015 Apr 02 [P15b].
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--Links to ADS abstracts:
©2015, 2019by Wm. Robert Johnston.
Last modified29 May 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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