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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 ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1097891812620967 3.0246e-08  
a 2.941009098623365 1.0491e-08 au
q 2.618118117601129 9.1312e-08 au
i 7.440499275799709 4.9306e-06 deg
node 9.867023429784659 2.5342e-05 deg
peri 89.61880471783599 3.3979e-05 deg
M 248.4254584378709 2.2536e-05 deg
tp 2459171.459875858954
(2020-Nov-17.95987586)
0.00011591 TDB
period 1842.226303881047
5.04
9.8576e-06
2.699e-08
d
yr
n .1954157310866652 1.0457e-09 deg/d
Q 3.263900079645601 1.1643e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2703  
   data-arc span      47403 days (129.78 yr)  
   first obs. used      1890-02-15  
   last obs. used      2019-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45789  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:40:37  

Additional Information
 Earth MOID = 1.64833 au 
 Jupiter MOID = 1.90567 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-January); 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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