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109777 (2001 RY81)
Classification: Main-belt Asteroid          SPK-ID: 2109777
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1755046196609082 5.4316e-08  
a 2.657298807387597 1.2844e-08 au
q 2.190930590871652 1.4169e-07 au
i 13.36772031316097 5.5011e-06 deg
node 30.25301449203389 1.6302e-05 deg
peri 11.04550907511611 2.105e-05 deg
M 186.3756127828122 1.3448e-05 deg
tp 2460159.575027470746
(2023-Aug-03.07502747)
6.2232e-05 TDB
period 1582.191386201041
4.33
1.1471e-05
3.141e-08
d
yr
n .2275325242822784 1.6496e-09 deg/d
Q 3.123667023903542 1.5098e-08 au
  Orbit Determination Parameters
   # obs. used (total)      795  
   data-arc span      8088 days (22.14 yr)  
   first obs. used      1999-03-21  
   last obs. used      2021-05-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51366  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 00:20:38  

Additional Information
 Earth MOID = 1.19943 au 
 Jupiter MOID = 2.32149 au 
 T_jup = 3.327 
[ 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 15.52   n/a E2021B55  
rotation period rot_per 7.93 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:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]

109777 (2001 RY81)          Discovered 2001-Sep-14 by Kusnirak, P. at Ondrejov
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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