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312 Pierretta (A891 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000312
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1598175353613069 3.4811e-08  
a 2.782272757719842 9.2174e-09 au
q 2.337616782878151 9.8657e-08 au
i 9.029343910645935 4.1319e-06 deg
node 6.254765727280766 2.5207e-05 deg
peri 262.7641333764172 2.8493e-05 deg
M 339.693190961949 1.4109e-05 deg
tp 2459096.117451901022
(2020-Sep-03.61745190)
6.65e-05 TDB
period 1695.110375040571
4.64
8.4236e-06
2.306e-08
d
yr
n .2123755510560094 1.0554e-09 deg/d
Q 3.226928732561534 1.069e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2803  
   data-arc span      47094 days (128.94 yr)  
   first obs. used      1891-08-29  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42344  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:14:13  

Additional Information
 Earth MOID = 1.34329 au 
 Jupiter MOID = 1.95843 au 
 T_jup = 3.296 
[ 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 8.8   n/a MPO473765 IRAS observations used: 27
diameter diameter 46.191 km 0.411 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.282 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Mohamed, R.A.; Chiorny, V.G.; Dovgopol, A.N.; Shevchenko, V.G. (1994) Astron. Astrophys. Suppl. Ser. 108, 69-72.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
geometric albedo albedo 0.230   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.843   0.076 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.52, mean=9.64, max.=9.76) deg.
U-B UB 0.429   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.52, mean=9.64, max.=9.76) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sk   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)

312 Pierretta (A891 QA)          Discovered 1891-Aug-28 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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