Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
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 ]  
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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1181752544121149 5.2265e-08  
a 1.917443355913537 6.9246e-09 au
q 1.690848999507635 9.8477e-08 au
i 22.92051178941251 6.0239e-06 deg
node 190.8400091746004 1.192e-05 deg
peri 194.0145768999179 2.5738e-05 deg
M 129.5469751685835 2.2234e-05 deg
tp 2457251.514793373341
(2015-Aug-17.01479337)
5.9807e-05 JED
period 969.8001379198927
2.66
5.2535e-06
1.438e-08
d
yr
n .3712105060864991 2.0109e-09 deg/d
Q 2.144037712319438 7.7429e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1174  
   data-arc span      14764 days (40.42 yr)  
   first obs. used      1975-10-03  
   last obs. used      2016-03-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46209  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 15:55:49  

Additional Information
 Earth MOID = .694428 au 
 Jupiter MOID = 3.26141 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. 2016-February); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2016-May-01 02:19 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin