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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1101015026795696 1.3971e-08  
a 2.942658937414214 8.5014e-09 au
q 2.618667766531444 4.2305e-08 au
i 7.43899484907469 3.1616e-07 deg
node 9.858524923061221 3.6014e-06 deg
peri 89.39104731375309 1.1403e-05 deg
M 5.866243660288359 1.0268e-05 deg
tp 2459170.455435202190
(2020-Nov-16.95543520)
5.2607e-05 TDB
period 1843.776691450945
5.05
7.99e-06
2.188e-08
d
yr
n .1952514106882982 8.4612e-10 deg/d
Q 3.266650108296985 9.4374e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3452  
   data-arc span      47876 days (131.08 yr)  
   first obs. used      1890-02-15  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42042  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:38:06  

Additional Information
 Earth MOID = 1.64855 au 
 Jupiter MOID = 1.90245 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 11.03   n/a E2021B10  
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. 2020-October); 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

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