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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 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

[ 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 1.99181991562378 1.99181941739209 1.99182041385558 2.0245804345141 1.80233871251307 2421349.380638076 1.66444337119725 70.8329442568976 47.6835964135185 50.256085118079 1795133.65230384 T 56 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:16 2021-Feb-24 00:44
1942-Jan-11 18:56 00:01 Jupiter 1.99384488615509 1.99384440342311 1.99384536888695 2.39821005802141 2.21399506760085 2430371.288609590 1.17031162476411 71.19611045021 19.1498011979788 -68.3990318373111 1954661.93391472 T 56 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:16 2021-Feb-24 00:44
2048-Feb-08 09:17 < 00:01 Jupiter 1.98974353392728 1.98974303728652 1.98974403056804 1.8534658500339 1.60746602517978 2469114.886587028 0.703539564860241 55.1080601112332 27.861889420519 -72.8730462225359 2690033.34585337 T 56 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:16 2021-Feb-24 00:44
2072-Oct-14 16:24 00:01 Jupiter 1.99946454401636 1.99946407170451 1.99946501632809 2.87996366343025 2.72890845476775 2478130.183416550 1.04261110285793 80.7155264630672 16.2684716973448 -80.3198579312533 2402867.30251678 T 56 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:16 2021-Feb-24 00:44
2178-Nov-20 08:26 00:03 Jupiter 1.98392238711212 1.98392188166153 1.98392289256282 2.06165094141202 1.84296442128955 2516881.851582598 2.95152463510629 97.7518432376498 38.16213392338 -32.804502916956 1265510.27481123 T 56 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:16 2021-Feb-24 00:44
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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