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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 58 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1410991684683837 2.6921e-08  
a 2.861361234091462 9.1938e-09 au
q 2.457625543273489 7.9838e-08 au
i 12.12405143595641 8.64e-07 deg
node 327.657307009245 2.4576e-06 deg
peri 289.5834076590074 4.6699e-06 deg
M 295.9250322255186 6.3832e-06 deg
tp 2459515.161316999243
(2021-Oct-27.66131700)
3.1865e-05 TDB
period 1767.899041610475
4.84
8.5206e-06
2.333e-08
d
yr
n .2036315375068344 9.8142e-10 deg/d
Q 3.265096924909436 1.0491e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3160  
   data-arc span      52412 days (143.50 yr)  
   first obs. used      1877-09-03  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43395  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:25:40  

Additional Information
 Earth MOID = 1.47298 au 
 Jupiter MOID = 2.00489 au 
 T_jup = 3.254 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457431.5 (2016-Feb-13.0) TDB
Reference: JPL 58 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1416530504816188 2.6895e-08  
q 2.457425941697263 7.9863e-08 au
tp 2457743.930596206241
(2016-Dec-21.43059621)
2.9368e-05 TDB
node 327.7044113563624 2.4563e-06 deg
peri 288.9475456874595 4.6103e-06 deg
i 12.12592873770165 8.6416e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3160  
   data-arc span      52412 days (143.50 yr)  
   first obs. used      1877-09-03  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43395  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:25:40  

Additional Information
 Jupiter MOID = 2.00489 au 
 T_jup = 3.254 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.233355038650723E-16 -2.138498676479271E-15 -5.609679463048912E-13 -1.000080933762443E-14 -3.676809533139321E-14 -3.671266763641022E-15
q -2.138498676479271E-15 6.378043412945151E-15 1.632188545312433E-12 2.955490847368049E-14 1.002770641223497E-13 1.089060575528041E-14
tp -5.609679463048912E-13 1.632188545312433E-12 8.6245888621743E-10 2.512835657602206E-11 1.054961932276231E-10 9.680896077580442E-12
node -1.000080933762443E-14 2.955490847368049E-14 2.512835657602206E-11 6.033209040584412E-12 -1.511718835083964E-12 2.003156712030796E-12
peri -3.676809533139321E-14 1.002770641223497E-13 1.054961932276231E-10 -1.511718835083964E-12 2.1254734402481E-11 -2.910643339406049E-13
i -3.671266763641022E-15 1.089060575528041E-14 9.680896077580442E-12 2.003156712030796E-12 -2.910643339406049E-13 7.467707646497927E-13

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 1.99182000746936 1.99181977959151 1.9918202353472 2.02457921555626 1.80233735543171 2421349.380698531 1.56323469385348 65.1935078507596 4.37410992487498 41.5441645030193 6856947.06416514 T 58 CATAB v2.0f-lin.ifort 2021-Apr-12 10:27:17 2021-Apr-12 10:27
1942-Jan-11 18:56 00:01 Jupiter 1.99384478802382 1.9938445623428 1.99384501370484 2.39821087420433 2.21399594331035 2430371.288674233 1.10551132230707 49.7144514203472 8.24782614146152 -68.1609424147815 10254385.9627061 T 58 CATAB v2.0f-lin.ifort 2021-Apr-12 10:27:17 2021-Apr-12 10:27
2048-Feb-08 09:17 < 00:01 Jupiter 1.98974357308235 1.98974335704436 1.98974378912021 1.85346531473981 1.6074654146408 2469114.886682277 0.608278929908111 16.9549175109841 7.76961869095327 -7.22475238518519 3923322.51343292 T 58 CATAB v2.0f-lin.ifort 2021-Apr-12 10:27:17 2021-Apr-12 10:27
2072-Oct-14 16:24 < 00:01 Jupiter 1.99946440439764 1.99946413163577 1.99946467715986 2.87996498598057 2.72890984054386 2478130.183596903 0.926510985001923 60.8009866450841 7.24075215806412 -87.2139280685853 9362809.51045613 T 58 CATAB v2.0f-lin.ifort 2021-Apr-12 10:27:17 2021-Apr-12 10:27
2178-Nov-20 08:27 00:03 Jupiter 1.98392235596407 1.9839221192357 1.98392259269243 2.0616519463165 1.84296554307876 2516881.851953900 2.70922467535424 86.4445772830424 12.0476328873522 -31.0831528803083 6076480.89842916 T 58 CATAB v2.0f-lin.ifort 2021-Apr-12 10:27:17 2021-Apr-12 10:27
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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