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189 Phthia (A878 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000189
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03566135066093312 3.81e-08  
a 2.45006879872295 6.0758e-09 au
q 2.36269603614828 9.4144e-08 au
i 5.175021172996956 4.2532e-06 deg
node 203.3578665254174 4.2769e-05 deg
peri 168.1126070083974 7.0596e-05 deg
M 336.5911888882491 5.6053e-05 deg
tp 2459091.584127568785
(2020-Aug-30.08412757)
0.00021811 TDB
period 1400.766821015634
3.84
5.2105e-06
1.427e-08
d
yr
n .2570020895690404 9.5599e-10 deg/d
Q 2.53744156129762 6.2925e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3009  
   data-arc span      51395 days (140.71 yr)  
   first obs. used      1880-02-08  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46372  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:25  

Additional Information
 Earth MOID = 1.36242 au 
 Jupiter MOID = 2.59456 au 
 T_jup = 3.490 
[ 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 9.3   n/a MPO492750 IRAS observations used: 14
diameter diameter 38.490 km 0.317 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 22.346 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2009) Minor Planet Bull. 36, 25-27.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.170   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.904   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.81, mean=10.24, max.=17.53) deg.
U-B UB 0.491   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A878 RA)          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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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