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174 Phaedra (A877 RA)

Classification: Main-belt Asteroid SPK-ID: 2000174

[ 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 51 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1411614255845109	3.8019e-08
a	2.861916562220357	1.0438e-08	au
q	2.457924340393409	1.0881e-07	au
i	12.12324734321833	4.4142e-06	deg
node	327.657034374718	1.9744e-05	deg
peri	289.5067493944895	2.5506e-05	deg
M	255.2908071526183	1.8181e-05	deg
t_p	2459514.858818296046 (2021-Oct-27.35881830)	9.0238e-05	TDB
period	1768.413732846445 4.84	9.6742e-06 2.649e-08	d yr
n	.2035722711904882	1.1137e-09	deg/d
Q	3.265908784047305	1.1911e-08	au

Orbit Determination Parameters

# obs. used (total)	2824
data-arc span	52102 days (142.65 yr)
first obs. used	1877-09-03
last obs. used	2020-04-28
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.45167
source	ORB
producer	Otto Matic
solution date	2020-May-20 01:00:13

Additional Information

Earth MOID = 1.47496 au

Jupiter MOID = 2.00501 au

T_jup = 3.254

[ 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	8.3		n/a	MPO502154	IRAS observations used: 19
diameter	diameter	64.849	km	0.392	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
rotation period	rot_per	5.744	h	n/a	LCDB (Rev. 2019-August); Warner et al., 2009	Published Reference List: [Magnusson, P.; Lagerkvist, C.-I. (1991) Astron. Astrophys. Suppl. Ser. 87, 269-275.] [Sada, P.V.; Cooney, W. (2001) Minor Planet Bull. 28, 39-40.] [Wang, X.-B.; Shi, Y. (2002) Earth, Moon, and Planets 91, 181-186; Wang, X.-B. (2002) Proc. ACM 2002, ESA SP 500, 501-503.] [Ivarsen, K.; Willis, S.; Ingleby, L.; Matthews, D.; Simet, M. (2004) Minor Planet Bull. 31, 29-33.] [Durech, J. (2006) IAU 2006, poster paper.] [Ruthroff, J.C. (2009) Minor Planet Bull. 36, 121-122.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [U. Iowa Physics web site (2011) http://phobos.physics.uiowa.edu/research/asteroids/] [Marciniak, A.; Michalowski, T.; Polinska, M.; Bartczak, P.; et al. (2011) Astron. Astrophys. 529, A107.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo	albedo	0.169		0.017	urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)
B-V	BV	0.858		0.018	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=2; phase (min.=10.52, mean=14.11, max.=17.69) deg.
U-B	UB	0.484		0.050	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=2; phase (min.=10.52, mean=14.11, max.=17.69) deg.
Tholen spectral type	spec_T	S		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 2 color indices
SMASSII spectral type	spec_B	S		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)

174 Phaedra (A877 RA) Discovered 1877-Sep-02 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DB	Last Updated: 2003-08-29

[ show close-approach data ]

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

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