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174 Phaedra
Classification: Main-belt Asteroid          SPK-ID: 2000174
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1438030451816518 5.5054e-08  
a 2.859259373330428 1.0568e-08 AU
q 2.448089168481331 1.5768e-07 AU
i 12.12980648900591 6.3849e-06 deg
node 327.7198013996612 2.8618e-05 deg
peri 289.1795134517563 3.6275e-05 deg
M 167.8224692864309 2.494e-05 deg
tp 2455977.260190990891
(2012-Feb-19.76019099)
0.00012106 JED
period 1765.951439657679
4.83
9.7909e-06
2.681e-08
d
yr
n .2038561151317866 1.1302e-09 deg/d
Q 3.270429578179525 1.2088e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1213  
   data-arc span      49834 days (136.44 yr)  
   first obs. used      1877-09-03  
   last obs. used      2014-02-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .65321  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Feb-19 17:47:39  

Additional Information
 Earth MOID = 1.46523 AU 
 T_jup = 3.254 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.48 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
diameter diameter 69.24 km 4.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
rotation period rot_per 5.744 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Magnusson, P.; Lagerkvist, C.-I. (1991) Astron. Astrophys. Suppl. Ser. 87, 269-275.]
[Sada, P.V.; Cooney, W. (2001) Minor Planet Bul. 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 Bul. 31, 29-33.]
[Durech, J. (2006) IAU 2006, poster paper.]
[Ruthroff, J.C. (2009) Minor Planet Bul. 36, 121-122.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Marciniak, A.; Michalowski, T.; Polinska, M.; Bartczak, P.; et al. (2011) Astron. Astrophys. 529, A107.]
[U. Iowa Physics web site (2011) http://phobos.physics.uiowa.edu/research/aste roids/]
geometric albedo albedo 0.1495   0.021 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
B-V BV .858 mag .018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=10.52, mean=14.11, max.=17.69) deg.
U-B UB .484 mag .050 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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