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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1826166581985869 3.7236e-08  
a 2.668385196182657 9.2605e-09 au
q 2.181093608869199 1.0026e-07 au
i 10.50840457655504 3.7891e-06 deg
node 247.096457504214 2.2898e-05 deg
peri 51.21992721814595 2.5706e-05 deg
M 73.26256105406836 1.0355e-05 deg
tp 2458676.495675873821
(2019-Jul-11.99567587)
4.5875e-05 TDB
period 1592.10318349835
4.36
8.288e-06
2.269e-08
d
yr
n .2261159978393908 1.1771e-09 deg/d
Q 3.155676783496114 1.0952e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2267  
   data-arc span      35557 days (97.35 yr)  
   first obs. used      1923-07-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44301  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:57:37  

Additional Information
 Earth MOID = 1.18263 au 
 Jupiter MOID = 2.07856 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456889.5 (2014-Aug-20.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1829471876462402 3.7099e-08  
q 2.180282136355736 1.0002e-07 au
tp 2457086.258069403232
(2015-Mar-04.75806940)
4.73e-05 TDB
node 247.1178257965704 2.2908e-05 deg
peri 51.67641120058351 2.5721e-05 deg
i 10.50585539909837 3.7886e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2267  
   data-arc span      35557 days (97.35 yr)  
   first obs. used      1923-07-12  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44301  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:57:37  

Additional Information
 Jupiter MOID = 2.07856 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.376328240376106E-15 -3.699847865453075E-15 2.328007187117423E-13 7.164233865892492E-15 2.39712505337161E-14 -3.155978995569925E-15
q -3.699847865453075E-15 1.000403322944986E-14 -7.163274802734731E-13 -1.831511361276811E-14 -8.955216308771133E-14 8.72555976554016E-15
tp 2.328007187117423E-13 -7.163274802734731E-13 2.237266141781621E-9 -2.017116647835746E-12 5.698198561883504E-10 -2.173652742444482E-12
node 7.164233865892492E-15 -1.831511361276811E-14 -2.017116647835746E-12 5.247789569482155E-10 -5.164543790242774E-10 1.103300129931962E-12
peri 2.39712505337161E-14 -8.955216308771133E-14 5.698198561883504E-10 -5.164543790242774E-10 6.615880553061566E-10 -1.565015261010979E-12
i -3.155978995569925E-15 8.72555976554016E-15 -2.173652742444482E-12 1.103300129931962E-12 -1.565015261010979E-12 1.435328766975617E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.6   n/a MPO492761  
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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