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7111 (1985 QA1)
Classification: Main-belt Asteroid          SPK-ID: 2007111
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07585211580444273 1.8876e-08  
a 2.405872426202021 7.1928e-09 au
q 2.22338191231903 4.7516e-08 au
i 7.544750406796939 6.3874e-07 deg
node 207.8484006032773 6.4467e-06 deg
peri 322.8981494398764 1.1229e-05 deg
M 13.00394350921721 1.1e-05 deg
tp 2459347.264325443973
(2021-May-12.76432544)
4.1604e-05 TDB
period 1363.035976556372
3.73
6.1126e-06
1.674e-08
d
yr
n .2641162861375957 1.1844e-09 deg/d
Q 2.588362940085013 7.7384e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2688  
   data-arc span      15594 days (42.69 yr)  
   first obs. used      1978-10-27  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42164  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 12:03:04  

Additional Information
 Earth MOID = 1.23323 au 
 Jupiter MOID = 2.38681 au 
 T_jup = 3.507 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.68   n/a MPO614063  
diameter diameter 6.121 km 0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.21 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Albers, K.; Kragh, K.; Monnier, A.; Pligge, Z.; et al. (2010) Minor Planet Bull. 37, 152-158.]
geometric albedo albedo 0.222   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7111 (1985 QA1)          Discovered 1985-Aug-17 by Helin, E. F. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1985 QA1 = 1978 UB5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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