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12946 (1290 T-1)
Classification: Main-belt Asteroid          SPK-ID: 2012946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06626320814116381 3.5378e-08  
a 2.395608888796814 8.762e-09 au
q 2.236868158373649 8.4718e-08 au
i 6.195609606536525 4.5549e-06 deg
node 194.8792567012602 3.351e-05 deg
peri 284.0156159829669 4.9254e-05 deg
M 158.5344374979924 3.4938e-05 deg
tp 2458404.092060967563
(2018-Oct-12.59206097)
0.00013146 TDB
period 1354.323145432652
3.71
7.4302e-06
2.034e-08
d
yr
n .2658154379285856 1.4583e-09 deg/d
Q 2.554349619219979 9.3426e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1417  
   data-arc span      17580 days (48.13 yr)  
   first obs. used      1971-03-24  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51523  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:06:49  

Additional Information
 Earth MOID = 1.26217 au 
 Jupiter MOID = 2.49383 au 
 T_jup = 3.518 
[ 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 14.9   n/a MPO473942  
rotation period rot_per 1.33 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]

12946 (1290 T-1)          Discovered 1971-Mar-25 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1944-Oct-23 13:51 < 00:01 Iris 0.0481218310485331 0.048118619443463 0.0481250436381762 4.62328612518329 4.62328609934403 2431387.077341456 0.932410266498112 390.503267036581 43.0149588353669 -66.5912666280828 153694.32407059 T 24 CATAB v2.0e-lin.ifort 2019-May-30 02:06:58 2019-May-30 02:07
1987-Aug-04 07:51 < 00:01 Juno 0.0491929930817365 0.0491914496868444 0.0491945365582313 5.1189786357524 5.11897858743991 2447011.827109138 0.336388763557288 144.472568633928 44.4031703405483 62.8104960736516 149156.420349791 T 24 CATAB v2.0e-lin.ifort 2019-May-30 02:06:58 2019-May-30 02:07

Alternate Designations
 1290 T-1 = 1997 GE13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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