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189 Phthia
Classification: Main-belt Asteroid          SPK-ID: 2000189
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03677396730234568 4.3764e-08  
a 2.450803994158914 8.0142e-09 AU
q 2.360678208213256 1.0851e-07 AU
i 5.17619010133167 5.2238e-06 deg
node 203.4415589461345 4.9609e-05 deg
peri 168.8190637401635 7.6551e-05 deg
M 130.5864134701627 5.8899e-05 deg
tp 2456292.157068005969
(2012-Dec-30.65706801)
0.00022906 JED
period 1401.397363284389
3.84
6.8739e-06
1.882e-08
d
yr
n .2568864545001604 1.26e-09 deg/d
Q 2.540929780104572 8.3089e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1358  
   data-arc span      49061 days (134.32 yr)  
   first obs. used      1880-02-08  
   last obs. used      2014-06-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61434  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:09:44  

Additional Information
 Earth MOID = 1.3592 AU 
 T_jup = 3.489 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.33 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
diameter diameter 37.66 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 22.346 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Pilcher, F. (2009) Minor Planet Bul. 36, 25-27.]
geometric albedo albedo 0.2310   0.027 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
B-V BV .904 mag .033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
U-B UB .491 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sa   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)

189 Phthia          Discovered 1878-Sep-09 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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