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Asteroids with Satellites Database--Johnston's Archive
(20325) Julianoey
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: | 2.378629142 AU | | orbital periodP: | 3.668513343 yr
(= 1339.949806 d) | | eccentricitye: | 0.076478504 | | perihelion distanceq: | 2.19671514 AU | | aphelion distanceQ: | 2.560543142 AU | | inclinationi: | 6.1028942° | | argument of perihelionω: | 256.319553° | | ascending nodeΩ: | 98.235495° | | mean anomalyM: | 71.285368° | | perihelion passageTP: | 2014 Mar 18.6700 | | Epoch: | 2014 Dec 09 | | data arc: | 1954-2013(1065 obs.) | | Earth MOID: | 1.20093 AU | | Jupiter Tisserand invariantTJ: | 3.528 |
orbital data, secondary: | semimajor axisas: | 10 km[*E] | | separation/primary radiusas/rp: | 4.2 [*E] | | separation/Hill radiusas/rH: | 0.012 [*E] | | orbital periodPs: | 0.9808± 0.0004d [P14d] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13.1[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 4.94± 1.01 km [M11b] | | geometric albedo: | 0.416± 0.172[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 820 km [*E] |
other data, primary: | diameterdp: | 4.73± 1.01 km [*D] | | rotation periodRPp: | 3.24474h [W17a] | | amplitude in mag., rotationalΔM: | 0.13 [W17a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 1.42± 0.31km [*D] | | diameter ratiods/dp: | 0.3± 0.02 [W17a] | | component mag. differenceΔM: | 2.61± 0.14 [*D] | | rotation periodRPs: | ? | |
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--(20325) Julianoey --discovery and notes:
Primary discovered1998 Apr 21from Kitt Peak Observatory, Arizona, USAby Spacewatch Program.Alternate designation(s):1998 HO27, 1977 TT6, 2004 BB159.Linked to prediscovery observations from 1954 May 28.Permanent number assigned 2001 Jan 09.
Named 2016 Jun 20 for Julian Oey (1964-) [MPC100606].
Companion discovered2014 by D. Pray, P. Pravec, V. Benishek, J. Pollock, W. Cooney, J. Gross, D. Terrell, D. E. Reichart, J. B. Haislip, A. P. LaCluyze, A. Verveer and T. Spuckusinglightcurve observations.Announced2014 Dec 24 [P14d].
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©2014-2017, 2019by Wm. Robert Johnston.
Last modified29 May 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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