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174 Phaedra

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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1411807875884903	4.0098e-08
a	2.862284602647187	1.1298e-08	au
q	2.458185008143048	1.1363e-07	au
i	12.12087237702294	4.6432e-06	deg
node	327.6684776122331	2.196e-05	deg
peri	289.3818847369056	2.7879e-05	deg
M	174.0155486097207	1.8429e-05	deg
t_p	2457745.525419797924 (2016-Dec-23.02541980)	8.9738e-05	TDB
period	1768.754868928728 4.84	1.0473e-05 2.867e-08	d yr
n	.203533008628855	1.2051e-09	deg/d
Q	3.266384197151325	1.2893e-08	au

Orbit Determination Parameters

# obs. used (total)	2331
data-arc span	51849 days (141.95 yr)
first obs. used	1877-09-03
last obs. used	2019-08-19
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.4802
source	ORB
producer	Otto Matic
solution date	2019-Sep-23 19:05:53

Additional Information

Earth MOID = 1.47493 au

Jupiter MOID = 2.00396 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	8.48		n/a	IRAS-A-FPA-3-RDR-IMPS-V6.0	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-January); 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 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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