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185 Eunike

Classification: Main-belt Asteroid SPK-ID: 2000185

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1290296156251524	4.4671e-08
a	2.739539454701055	5.936e-09	AU
q	2.386057731871039	1.2306e-07	AU
i	23.22355123556804	5.4516e-06	deg
node	153.8620174862855	1.272e-05	deg
peri	224.592866076356	2.3466e-05	deg
M	65.77974360410187	2.0036e-05	deg
t_p	2456097.875251367284 (2012-Jun-19.37525137)	9.2056e-05	JED
period	1656.207573010126 4.53	5.3829e-06 1.474e-08	d yr
n	.217364058628054	7.0647e-10	deg/d
Q	3.093021177531071	6.7019e-09	AU

Orbit Determination Parameters

# obs. used (total)	1834
data-arc span	46905 days (128.42 yr)
first obs. used	1884-07-12
last obs. used	2012-12-13
planetary ephem.	DE405
SB-pert. ephem.	SB405-CPV-2
condition code	0
fit RMS	.51651
data source	ORB
producer	Otto Matic
solution date	2013-Mar-29 14:34:18

Additional Information

Earth MOID = 1.42093 AU

T_jup = 3.222

[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	7.62	mag	n/a	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 23
diameter	diameter	157.51	km	2.6	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 23
rotation period	rot_per	21.797	h	n/a	Asteroid Lightcurve DataBase (Rev. 2013-May-01)	Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F.; Ruthroff, J.C. (2012) Minor Planet Bul. 39, 13.] [Hills, K. (2013) Minor Planet Bul. 40, 89-90.]
geometric albedo	albedo	0.0638		0.002	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 23
B-V	BV	.668	mag	.040	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1	#obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.
U-B	UB	.331	mag	.031	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1	#obs=4; phase (min.=18.02, mean=21.23, max.=23.82) deg.
Tholen spectral type	spec_T	C		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 7 color indices
SMASSII spectral type	spec_B	C		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

185 Eunike Discovered 1878-Mar-01 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DB	Last Updated: 2003-08-29

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

2013-May-18 12:01 UT
(server date/time)

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