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15964 Billgray (1998 DU)
Classification: Inner Main-belt Asteroid          SPK-ID: 2015964
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09226773783756959 3.6089e-08  
a 1.95251586628075 6.6771e-09 au
q 1.772361644207063 6.9999e-08 au
i 18.07763022157644 7.1633e-06 deg
node 309.5510348476984 1.173e-05 deg
peri 110.5791798792238 4.6348e-05 deg
M 214.2153916030728 4.5272e-05 deg
tp 2459604.051957433599
(2022-Jan-24.55195743)
0.00012641 TDB
period 996.5297864678957
2.73
5.1118e-06
1.4e-08
d
yr
n .3612536272257204 1.8531e-09 deg/d
Q 2.132670088354438 7.2932e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1128  
   data-arc span      24353 days (66.67 yr)  
   first obs. used      1953-10-08  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52736  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:14:17  

Additional Information
 Earth MOID = .849315 au 
 Jupiter MOID = 3.077 au 
 T_jup = 3.825 
[ 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 15.11   n/a E2021B10  
rotation period rot_per 3.571 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D (2011) Minor Planet Bull. 38, 25-31.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 144-155.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

15964 Billgray           Discovered 1998 Feb. 19 by J. M. Roe at Oaxaca.
Bill Gray (b. 1965) has made several contributions to astrometry, in particular with his Guide series of starcharting software, his Charon astrometry program and his reduction of the GSC 1.1 star catalog to the ACT frame (GSC-ACT).
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1998 DU = 1980 RE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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