Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 168 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1683607613431791 3.6303e-08  
a 1.370066283515552 1.4629e-09 au
q 1.139400880932254 4.9699e-08 au
i 15.65109135868616 4.0255e-06 deg
node 215.4376047246234 1.0641e-05 deg
peri 192.9383778230118 1.6284e-05 deg
M 4.13456163279634 1.5456e-05 deg
tp 2459193.772746947259
(2020-Dec-10.27274695)
2.5144e-05 TDB
period 585.7479738060497
1.60
9.3818e-07
2.569e-09
d
yr
n .6145987969208094 9.8439e-10 deg/d
Q 1.60073168609885 1.7092e-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 = .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 168 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1684467087682369 3.6295e-08  
q 1.139271747336329 4.9725e-08 au
tp 2457436.539949765206
(2016-Feb-18.03994977)
2.3945e-05 TDB
node 215.4623346332017 1.064e-05 deg
peri 192.855393283861 1.6275e-05 deg
i 15.65124352231994 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.      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
 Jupiter MOID = 3.77054 au 
 T_jup = 4.772 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.317353462740404E-15 -1.804222405007019E-15 -3.804742401257216E-13 -1.048637313932942E-14 -1.55268588669076E-13 5.856563453737005E-15
q -1.804222405007019E-15 2.472602725152559E-15 5.323106539451312E-13 1.381111322209129E-14 2.181609615084824E-13 -7.943741325911096E-15
tp -3.804742401257216E-13 5.323106539451312E-13 5.733411087886784E-10 1.094729343674093E-13 2.958514718816912E-10 9.226589721120991E-12
node -1.048637313932942E-14 1.381111322209129E-14 1.094729343674093E-13 1.13210542183339E-10 -1.084514075578936E-10 5.384649813582532E-13
peri -1.55268588669076E-13 2.181609615084824E-13 2.958514718816912E-10 -1.084514075578936E-10 2.648827978373887E-10 4.324322321349544E-12
i 5.856563453737005E-15 -7.943741325911096E-15 9.226589721120991E-12 5.384649813582532E-13 4.324322321349544E-12 1.62068352085327E-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 18.0   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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Mar-03 12:32 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin