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899 Jokaste (A918 PH)
Classification: Main-belt Asteroid          SPK-ID: 2000899
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2010626780670222 3.685e-08  
a 2.905970999861242 1.0984e-08 au
q 2.321688688244039 1.0761e-07 au
i 12.46762467469707 4.032e-06 deg
node 252.4185598463415 1.8532e-05 deg
peri 127.5178469718442 2.1481e-05 deg
M 148.5411662688068 1.3142e-05 deg
tp 2458253.914296197695
(2018-May-15.41429620)
6.3772e-05 TDB
period 1809.403144731272
4.95
1.0259e-05
2.809e-08
d
yr
n .1989606357479092 1.1281e-09 deg/d
Q 3.490253311478446 1.3193e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2579  
   data-arc span      37240 days (101.96 yr)  
   first obs. used      1918-08-03  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41158  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:34  

Additional Information
 Earth MOID = 1.34956 au 
 Jupiter MOID = 2.07063 au 
 T_jup = 3.220 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456481.5 (2013-Jul-08.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1971484874361741 3.6878e-08  
q 2.334960591930871 1.0722e-07 au
tp 2456443.136250968064
(2013-May-30.63625097)
6.071e-05 TDB
node 252.6339316765539 1.8488e-05 deg
peri 127.5932505470249 2.1576e-05 deg
i 12.47585877787434 4.034e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2579  
   data-arc span      37240 days (101.96 yr)  
   first obs. used      1918-08-03  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41158  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:34  

Additional Information
 Jupiter MOID = 2.07063 au 
 T_jup = 3.220 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.360007252230681E-15 -3.941092784443863E-15 4.736820136972304E-13 9.478803881299682E-16 5.315324915851182E-14 3.175797207989618E-15
q -3.941092784443863E-15 1.149651065779695E-14 -1.183052615546441E-12 -3.175412843734128E-15 -1.219999133207898E-13 -9.311398485551277E-15
tp 4.736820136972304E-13 -1.183052615546441E-12 3.685703454648562E-9 -1.281762570110115E-11 6.951556456538275E-10 -5.789142555304071E-13
node 9.478803881299682E-16 -3.175412843734128E-15 -1.281762570110115E-11 3.418080613705462E-10 -3.356852038165325E-10 -1.385630282223036E-12
peri 5.315324915851182E-14 -1.219999133207898E-13 6.951556456538275E-10 -3.356852038165325E-10 4.655156185906241E-10 1.201840707516545E-12
i 3.175797207989618E-15 -9.311398485551277E-15 -5.789142555304071E-13 -1.385630282223036E-12 1.201840707516545E-12 1.627355075590506E-11

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 10.1   n/a MPO502161 IRAS observations used: 20
diameter diameter 31.018 km 0.243 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.245 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2004) Minor Planet Bull. 31, 40-41.]
[Menke, J. (2005) Minor Planet Bull. 32, 85-88.]
[Clark, M. (2006) Minor Planet Bull. 33, 53-56.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Bowens-Rubin, R.; Henderson, P. (2014) Minor Planet Bull. 41, 58-59.]
geometric albedo albedo 0.161   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.676   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=3.18, mean=5.72, max.=12.70) deg.
U-B UB 0.255   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=3.18, mean=5.72, max.=12.70) deg.
Tholen spectral type spec_T XB   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

899 Jokaste (A918 PH)          Discovered 1918-Aug-03 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A918 PH = 1953 TL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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