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19918 (1977 PB)
Classification: Main-belt Asteroid          SPK-ID: 2019918
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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340317455761135 2.7214e-08  
a 2.649082093845174 1.0261e-08 au
q 2.294020996632679 7.0079e-08 au
i 13.54735056941216 4.2235e-06 deg
node 132.1565027817047 1.2574e-05 deg
peri 112.8834148517323 2.1232e-05 deg
M 36.15480237714739 1.5962e-05 deg
tp 2458842.336945454707
(2019-Dec-24.83694545)
6.9802e-05 TDB
period 1574.858549698366
4.31
9.1502e-06
2.505e-08
d
yr
n .2285919583501332 1.3282e-09 deg/d
Q 3.004143191057668 1.1636e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2308  
   data-arc span      15808 days (43.28 yr)  
   first obs. used      1977-08-06  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44085  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:12:22  

Additional Information
 Earth MOID = 1.31831 au 
 Jupiter MOID = 2.1791 au 
 T_jup = 3.339 
[ 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 13.1   n/a MPO474028  
diameter diameter 7.546 km 0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.6897 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Clark, M. (2016) Minor Planet Bull. 43, 2-5.]
geometric albedo albedo 0.200   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

19918 (1977 PB)          Discovered 1977-Aug-06 by Lagerkvist, C.-I. at Mount Stromlo
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1977 PB = 1990 KE2 = 1990 SO18 = 1998 KV60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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