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280 Philia
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1099392155164318 3.0044e-08  
a 2.942017029007316 1.038e-08 au
q 2.618573984802268 9.0908e-08 au
i 7.439296543266159 4.9249e-06 deg
node 9.865014053547219 2.4967e-05 deg
peri 89.4547277567795 3.3697e-05 deg
M 326.7484063986198 2.2565e-05 deg
tp 2459170.745704643567
(2020-Nov-17.24570464)
0.00011571 TDB
period 1843.173425202097
5.05
9.7551e-06
2.671e-08
d
yr
n .1953153160075142 1.0337e-09 deg/d
Q 3.265460073212363 1.1522e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2758  
   data-arc span      47442 days (129.89 yr)  
   first obs. used      1890-02-15  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4553  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:22:05  

Additional Information
 Earth MOID = 1.64865 au 
 Jupiter MOID = 1.90362 au 
 T_jup = 3.251 
[ 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 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          Discovered 1888-Oct-29 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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