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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
tp 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.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1917-Apr-30 21:08 00:02 Jupiter 1.99181992225758 1.99181941892841 1.99182042558698 2.02458041314026 1.80233868928949 2421349.380644840 1.70871442843231 72.3651669869752 48.8722890653606 50.423980795649 1763377.31948076 T 51 CATAB v2.0f-lin.ifort 2020-May-20 01:00:35 2020-May-20 01:00
1942-Jan-11 18:56 00:01 Jupiter 1.99384489302375 1.99384440050059 1.9938453855468 2.39821025726488 2.21399528408333 2430371.288627850 1.1990992766234 73.2802824660003 19.6909654558894 -68.7725466726186 1910002.28786899 T 51 CATAB v2.0f-lin.ifort 2020-May-20 01:00:35 2020-May-20 01:00
2048-Feb-08 09:17 < 00:01 Jupiter 1.98974354138867 1.98974303901795 1.98974404375939 1.85346586127492 1.60746603913415 2469114.886582552 0.724263829484554 56.6241218136427 28.168997152356 -73.4046474111158 2646706.26974717 T 51 CATAB v2.0f-lin.ifort 2020-May-20 01:00:35 2020-May-20 01:00
2072-Oct-14 16:24 00:01 Jupiter 1.99946454892583 1.99946407325033 1.99946502460123 2.87996377342054 2.72890857122758 2478130.183419535 1.07469987876092 82.0128928503917 16.5019644531193 -79.9693964929593 2380061.23799665 T 51 CATAB v2.0f-lin.ifort 2020-May-20 01:00:35 2020-May-20 01:00
2178-Nov-20 08:26 00:03 Jupiter 1.98392239515849 1.98392188084191 1.98392290947529 2.06165096765464 1.84296445158569 2516881.851577629 3.03625677870448 99.3223546553597 39.2389715290632 -32.1458967470118 1237409.86384057 T 51 CATAB v2.0f-lin.ifort 2020-May-20 01:00:35 2020-May-20 01:00
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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