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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03708260021113905 4.3682e-08  
a 2.449984700701033 7.8921e-09 AU
q 2.359132897521529 1.0821e-07 AU
i 5.177384950456024 5.2103e-06 deg
node 203.4302041618495 4.9494e-05 deg
peri 168.5596652940768 7.6075e-05 deg
M 182.2514361064179 5.84e-05 deg
tp 2457692.087420573662
(2016-Oct-30.58742057)
0.00022762 JED
period 1400.694700158462
3.83
6.7681e-06
1.853e-08
d
yr
n .2570153224391246 1.2419e-09 deg/d
Q 2.540836503880536 8.1848e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1390  
   data-arc span      49314 days (135.01 yr)  
   first obs. used      1880-02-08  
   last obs. used      2015-02-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60812  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:26:42  

Additional Information
 Earth MOID = 1.35904 AU 
 T_jup = 3.490 
[ 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 LCDB (Rev. 2015-Feb); Warner et al., 2009 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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