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25 Phocaea
Classification: Main-belt Asteroid          SPK-ID: 2000025
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2555569269925809 2.4745e-08  
a 2.399410465157924 2.9235e-09 AU
q 1.786224500088326 5.9271e-08 AU
i 21.59115234652229 3.1074e-06 deg
node 214.224403084551 8.105e-06 deg
peri 90.0514658753157 1.004e-05 deg
M 109.0181168461525 5.7597e-06 deg
tp 2456589.396262592629
(2013-Oct-23.89626259)
2.1338e-05 JED
period 1357.548174084763
3.72
2.4811e-06
6.793e-09
d
yr
n .2651839594883667 4.8465e-10 deg/d
Q 3.012596430227522 3.6706e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2292  
   data-arc span      56476 days (154.62 yr)  
   first obs. used      1860-03-11  
   last obs. used      2014-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49074  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:40:28  

Additional Information
 Earth MOID = .922019 AU 
 T_jup = 3.389 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.83 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
diameter diameter 75.13 km 3.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
rotation period rot_per 9.9341 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Buchheim, R.K. (2007) Minor Planet Bul. 34, 68-71.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 133-136.]
[Pilcher, F. (2011) Minor Planet Bul. 38, 76-78.]
geometric albedo albedo 0.2310   0.024 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 21
B-V BV .932 mag .014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=6; phase (min.=9.54, mean=17.15, max.=25.41) deg.
U-B UB .513 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=6; phase (min.=9.54, mean=17.15, max.=25.41) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

25 Phocaea          Discovered 1853-Apr-06 by Chacornac, J. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1956 GC 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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