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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 169 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1683607613576692 3.6302e-08  
a 1.370066283442893 1.463e-09 au
q 1.139400880851976 4.9699e-08 au
i 15.65109134427083 4.0255e-06 deg
node 215.4376047454923 1.0641e-05 deg
peri 192.9383777637107 1.6283e-05 deg
M 4.134561641415305 1.5456e-05 deg
tp 2459193.772746933771
(2020-Dec-10.27274693)
2.5144e-05 TDB
period 585.747973759454
1.60
9.3819e-07
2.569e-09
d
yr
n .6145987969697003 9.844e-10 deg/d
Q 1.600731686033811 1.7093e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51104  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:58:35  

Additional Information
 Earth MOID = .149413 au 
 Jupiter MOID = 3.77054 au 
 T_jup = 4.772 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457280.5 (2015-Sep-15.0) TDB
Reference: JPL 169 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .168446708873 3.6295e-08  
q 1.139271747185155 4.9725e-08 au
tp 2457436.539949725924
(2016-Feb-18.03994973)
2.3944e-05 TDB
node 215.4623346597764 1.064e-05 deg
peri 192.8553932097834 1.6275e-05 deg
i 15.65124350894479 4.0258e-06 deg
  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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51104  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:58:35  

Additional Information
 Jupiter MOID = 3.77054 au 
 T_jup = 4.772 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.31735025960981E-15 -1.804220291090483E-15 -3.804650561071067E-13 -1.048620499114537E-14 -1.552643156066579E-13 5.856727684058018E-15
q -1.804220291090483E-15 2.472602860458666E-15 5.322993258202505E-13 1.381091517095379E-14 2.181555819976639E-13 -7.94394197554489E-15
tp -3.804650561071067E-13 5.322993258202505E-13 5.733269187200454E-10 1.094309824473028E-13 2.958451936029445E-10 9.226372626438973E-12
node -1.048620499114537E-14 1.381091517095379E-14 1.094309824473028E-13 1.132105393593064E-10 -1.084514257058683E-10 5.38459739402662E-13
peri -1.552643156066579E-13 2.181555819976639E-13 2.958451936029445E-10 -1.084514257058683E-10 2.648800465632959E-10 4.324230923152197E-12
i 5.856727684058018E-15 -7.94394197554489E-15 9.226372626438973E-12 5.38459739402662E-13 4.324230923152197E-12 1.620683126742975E-11

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 18.01   n/a MPCxxxxx  
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

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