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209 Dido (A879 UC)

Classification: Main-belt Asteroid SPK-ID: 2000209

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 101 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.05607269028397318	3.9099e-08
a	3.148564467098098	1.3823e-08	au
q	2.972015986895383	1.2151e-07	au
i	7.168801207628556	4.928e-06	deg
node	.6536476028880224	3.2833e-05	deg
peri	249.5077620084776	5.4606e-05	deg
M	197.7457941316522	4.4998e-05	deg
t_p	2459920.230892714000 (2022-Dec-06.73089271)	0.00025699	TDB
period	2040.644306291176 5.59	1.3438e-05 3.679e-08	d yr
n	.1764148699948065	1.1617e-09	deg/d
Q	3.325112947300813	1.4598e-08	au

Orbit Determination Parameters

# obs. used (total)	2836
data-arc span	51308 days (140.47 yr)
first obs. used	1879-10-26
last obs. used	2020-04-17
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.44098
source	ORB
producer	Otto Matic
solution date	2020-May-20 01:00:42

Additional Information

Earth MOID = 1.96857 au

Jupiter MOID = 1.71736 au

T_jup = 3.194

[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	8.2		n/a	MPO502154	IRAS observations used: 20
diameter	diameter	179.008	km	1.060	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)
rotation period	rot_per	5.7366	h	n/a	LCDB (Rev. 2019-August); Warner et al., 2009	Published Reference List: [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Collaborative Asteroid Lightcurve Link (CALL) (2011) http://www.minorplanetobserver.com/DATA/submissions_results.htm]
geometric albedo	albedo	0.028		0.004	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)
B-V	BV	0.691		0.019	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=5; phase (min.=2.98, mean=7.14, max.=12.26) deg.
U-B	UB	0.294		0.034	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=5; phase (min.=2.98, mean=7.14, max.=12.26) deg.
Tholen spectral type	spec_T	C		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type	spec_B	Xc		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)

209 Dido (A879 UC) Discovered 1879-Oct-22 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DB	Last Updated: 2003-08-29

[ show close-approach data ]

Alternate Designations

A879 UC = A909 AB = A909 GB = A912 RB

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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