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280 Philia (A888 UB)
Classification: Main-belt Asteroid          SPK-ID: 2000280
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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1099392149003424 2.994e-08  
a 2.942017028710791 1.0329e-08 au
q 2.618573986350889 9.0644e-08 au
i 7.439296412517482 4.9099e-06 deg
node 9.865015147977857 2.4821e-05 deg
peri 89.45472554273776 3.3568e-05 deg
M 326.7484076272414 2.2501e-05 deg
tp 2459170.745698327377
(2020-Nov-17.24569833)
0.00011538 TDB
period 1843.173424923439
5.05
9.7064e-06
2.657e-08
d
yr
n .1953153160370427 1.0286e-09 deg/d
Q 3.265460071070694 1.1464e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2861  
   data-arc span      47654 days (130.47 yr)  
   first obs. used      1890-02-15  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45127  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:24  

Additional Information
 Earth MOID = 1.64865 au 
 Jupiter MOID = 1.90362 au 
 T_jup = 3.251 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456266.5 (2012-Dec-05.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067264295594694 3.0005e-08  
q 2.630034425648919 9.0609e-08 au
tp 2455482.101123363242
(2010-Oct-12.60112336)
0.00011726 TDB
node 9.939704137790924 2.4788e-05 deg
peri 89.43807740094283 3.4001e-05 deg
i 7.443651876096612 4.9094e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2861  
   data-arc span      47654 days (130.47 yr)  
   first obs. used      1890-02-15  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45127  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:24  

Additional Information
 Jupiter MOID = 1.90362 au 
 T_jup = 3.251 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.003021763457565E-16 -2.705004993827498E-15 -9.118003264123488E-14 -2.722611920781268E-15 5.397643075382507E-15 -7.387963367427594E-16
q -2.705004993827498E-15 8.210060931669521E-15 2.781087383570762E-13 9.880793793392563E-15 -1.205895105784898E-14 2.963354624303029E-15
tp -9.118003264123488E-14 2.781087383570762E-13 1.375094590581555E-8 -8.425816688564805E-12 2.73762930226761E-9 -6.461687652879675E-12
node -2.722611920781268E-15 9.880793793392563E-15 -8.425816688564805E-12 6.144627932469717E-10 -6.103204648395665E-10 8.510846648673767E-12
peri 5.397643075382507E-15 -1.205895105784898E-14 2.73762930226761E-9 -6.103204648395665E-10 1.156072270761946E-9 -9.574738592035355E-12
i -7.387963367427594E-16 2.963354624303029E-15 -6.461687652879675E-12 8.510846648673767E-12 -9.574738592035355E-12 2.410264985916336E-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 11.0   n/a MPO502155  
diameter diameter 45.69 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 70.26 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Benishek, V.; Ferrero, A.; Hamanowa, H.; Hamanowa, H.; Stephens, R.D. (2011) Minor Planet Bull. 38, 127-128.]
geometric albedo albedo 0.0444   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV 0.650   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.44 deg.
U-B UB 0.220   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.44 deg.

280 Philia (A888 UB)          Discovered 1888-Oct-29 by Palisa, J. at Vienna
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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