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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1410991123792434 3.72e-08  
a 2.861361224505154 1.0122e-08 au
q 2.457625695531092 1.0689e-07 au
i 12.12404399218873 4.3751e-06 deg
node 327.657334160536 1.9219e-05 deg
peri 289.5833674206762 2.4932e-05 deg
M 295.9250492798766 1.7737e-05 deg
tp 2459515.161231666883
(2021-Oct-27.66123167)
8.7607e-05 TDB
period 1767.899032726089
4.84
9.3812e-06
2.568e-08
d
yr
n .2036315385301628 1.0806e-09 deg/d
Q 3.265096753479216 1.1551e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3063  
   data-arc span      52366 days (143.37 yr)  
   first obs. used      1877-09-03  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43632  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:44:07  

Additional Information
 Earth MOID = 1.47298 au 
 Jupiter MOID = 2.00489 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 8.34   n/a E2021B10 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. 2020-October); 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.DBLast Updated: 2003-08-29

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