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997 Priska (A923 NC)
Classification: Main-belt Asteroid          SPK-ID: 2000997
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1824062494242237 1.7352e-08  
a 2.669438617850329 8.6169e-09 au
q 2.182516331500067 4.6138e-08 au
i 10.50564437011828 5.9682e-07 deg
node 247.0942035320105 5.1677e-06 deg
peri 51.33772330259858 6.2902e-06 deg
M 162.6545139413364 5.8388e-06 deg
tp 2458676.732960909534
(2019-Jul-12.23296091)
2.4585e-05 TDB
period 1593.046069204214
4.36
7.7134e-06
2.112e-08
d
yr
n .2259821652112255 1.0942e-09 deg/d
Q 3.156360904200592 1.0189e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2561  
   data-arc span      35701 days (97.74 yr)  
   first obs. used      1923-07-12  
   last obs. used      2021-04-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4349  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:49:45  

Additional Information
 Earth MOID = 1.18373 au 
 Jupiter MOID = 2.07667 au 
 T_jup = 3.334 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.62   n/a MPCxxxxx  
diameter diameter 20.391 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 16.241 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2019) Minor Planet Bull. 46, 445-448.]
geometric albedo albedo 0.057   0.000 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Ch   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)

997 Priska (A923 NC)          Discovered 1923-Jul-12 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A923 NC = 1959 WA = 1967 RN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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