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JPL Small-Body Database Browser
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91472 (1999 RY91)
Classification: Main-belt Asteroid          SPK-ID: 2091472
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1328446064020447 3.8208e-08  
a 3.106339015020523 2.8616e-08 au
q 2.693678631218806 1.2298e-07 au
i 12.43072186799333 6.5856e-06 deg
node 181.8025293148472 2.0981e-05 deg
peri 94.11489247038818 3.411e-05 deg
M 350.9715047959786 2.6189e-05 deg
tp 2459050.651574807478
(2020-Jul-20.15157481)
0.00014567 TDB
period 1999.731574609513
5.47
2.7633e-05
7.566e-08
d
yr
n .1800241615279276 2.4876e-09 deg/d
Q 3.51899939882224 3.2417e-08 au
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      7645 days (20.93 yr)  
   first obs. used      1998-05-26  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5734  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 06:04:02  

Additional Information
 Earth MOID = 1.71482 au 
 Jupiter MOID = 1.73838 au 
 T_jup = 3.171 
[ 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 14.7   n/a MPO432452  
diameter diameter 4.236 km 0.311 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 51.997 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.142   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91472 (1999 RY91)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 RY91 = 2003 GJ9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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