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849 Ara (A915 UB)

Classification: Main-belt Asteroid SPK-ID: 2000849

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.200918135337036	3.6321e-08
a	3.146181404624356	1.1745e-08	au
q	2.514056503375173	1.1649e-07	au
i	19.53026776519042	4.8085e-06	deg
node	228.3651492309061	1.1358e-05	deg
peri	63.29327824918501	1.5761e-05	deg
M	323.2911500129719	1.1853e-05	deg
t_p	2459208.346322623516 (2020-Dec-24.84632262)	6.7641e-05	TDB
period	2038.327982786349 5.58	1.1414e-05 3.125e-08	d yr
n	.1766153450476051	9.8902e-10	deg/d
Q	3.778306305873538	1.4105e-08	au

Orbit Determination Parameters

# obs. used (total)	2895
data-arc span	37008 days (101.32 yr)
first obs. used	1919-07-03
last obs. used	2020-10-28
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.44843
source	ORB
producer	Otto Matic
solution date	2020-Nov-13 04:25:05

Additional Information

Earth MOID = 1.56462 au

Jupiter MOID = 1.575 au

T_jup = 3.090

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Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	8.2		n/a	MPO473773	IRAS observations used: 4
diameter	diameter	80.756	km	1.127	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
rotation period	rot_per	4.116	h	n/a	LCDB (Rev. 2020-October); Warner et al., 2009	Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J. (2006) IAU 2006, poster paper.] [Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.] [Gandolfi, D.; Cigna, M.; Fulvio, D.; Blanco, C. (2009) Planet. Space Sci. 57, 1-9.] [Marciniak, A.; Michalowski, T.; Hirsch, R.; Polinska, K.; et al. (2009) Astron. Astrophys. 498, 313-320.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.] [Schmidt, R.E. (2017) Minor Planet Bull. 44, 191-192.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo	albedo	0.186		0.023	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)
B-V	BV	0.701		0.013	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=4; phase (min.=14.84, mean=18.35, max.=21.79) deg.
U-B	UB	0.252		0.016	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=4; phase (min.=14.84, mean=18.35, max.=21.79) deg.
Tholen spectral type	spec_T	M		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 7 color indices; used ground-based radiometric albedo

849 Ara (A915 UB) Discovered 1912-Feb-09 by Belyavskij, S. at Simeis
Reference: DISCOVERY.DB	Last Updated: 2003-08-29

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Alternate Designations

A915 UB = 1935 FU = 1960 WN = A912 CD

2021-Jan-21 04:17 UT
(server date/time)

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