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4947 Ninkasi (1988 TJ1)
Classification: Amor [NEO]          SPK-ID: 2004947
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 168 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1683454849819254 3.63e-08  
a 1.370090507339164 1.4927e-09 au
q 1.13944195641202 4.9722e-08 au
i 15.65097689686027 4.0255e-06 deg
node 215.446525772982 1.0641e-05 deg
peri 192.9098482949488 1.6281e-05 deg
M 241.2324101611476 1.536e-05 deg
tp 2459193.749222584010
(2020-Dec-10.24922258)
2.5136e-05 TDB
period 585.7635085854479
1.60
9.5727e-07
2.621e-09
d
yr
n .6145824974132632 1.0044e-09 deg/d
Q 1.600739058266307 1.744e-09 au
  Orbit Determination Parameters
   # obs. used (total)      728  
   data-arc span      15674 days (42.91 yr)  
   first obs. used      1978-02-17  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51102  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-14 05:23:31  

Additional Information
 Earth MOID = .150456 au 
 Jupiter MOID = 3.77006 au 
 T_jup = 4.772 
[ 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 18.0   n/a MPO244224  
rotation period rot_per 21.1 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
SMASSII spectral type spec_B Sq   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)

4947 Ninkasi (1988 TJ1)          Discovered 1988-Oct-12 by Shoemaker, C. S. at Palomar
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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