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7247 Robertstirling (1991 TD1)
Classification: Inner Main-belt Asteroid          SPK-ID: 2007247
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1182268586275901 5.6028e-08  
a 1.917094110718756 7.1334e-09 au
q 1.690442096315024 1.0637e-07 au
i 22.91959092782083 6.906e-06 deg
node 190.8432330078995 1.1946e-05 deg
peri 193.9183745693931 2.6013e-05 deg
M 55.38729772633324 2.293e-05 deg
tp 2457251.333516146339
(2015-Aug-16.83351615)
6.1676e-05 JED
period 969.535189325312
2.65
5.4114e-06
1.482e-08
d
yr
n .3713119482032619 2.0724e-09 deg/d
Q 2.143746125122488 7.9768e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1060  
   data-arc span      14682 days (40.20 yr)  
   first obs. used      1975-10-03  
   last obs. used      2015-12-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47071  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:03:10  

Additional Information
 Earth MOID = .693523 au 
 Jupiter MOID = 3.2617 au 
 T_jup = 3.824 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5 mag n/a MPO358702  
rotation period rot_per 3.176 h n/a LCDB (Rev. 2015-December); 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:
[Warner, Brian D. (2014) Minor Planet Bul. 41, 235-241.]

7247 Robertstirling           Discovered 1991 Oct. 12 by R. H. McNaught at Siding Spring.
Robert Stirling (1790-1878) was a Scottish inventor who invented and built the first practical closed-cycle hot-air engine. Although several other designs were invented elsewhere, this general class of engine, incorporating his `Economiser', is now termed the Stirling engine.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-08-10Last Updated: 2014-08-13

Alternate Designations
 1991 TD1 = 1975 TQ2 = 1990 FS4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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