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13405 Dorisbillings (1999 ST1)
Classification: Main-belt Asteroid          SPK-ID: 2013405
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09949509067593408 1.5546e-08  
a 2.293925145640899 6.3791e-09 au
q 2.065690855271552 3.5878e-08 au
i 4.83549957723424 7.1479e-07 deg
node 327.9085924124271 3.192e-06 deg
peri 190.7705305542845 6.854e-06 deg
M 247.5228138171235 6.005e-06 deg
tp 2459596.987255754036
(2022-Jan-17.48725575)
2.2262e-05 TDB
period 1269.016561628591
3.47
5.2934e-06
1.449e-08
d
yr
n .283684240919594 1.1833e-09 deg/d
Q 2.522159436010245 7.0138e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2815  
   data-arc span      24289 days (66.50 yr)  
   first obs. used      1954-09-06  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41862  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:56:04  

Additional Information
 Earth MOID = 1.07474 au 
 Jupiter MOID = 2.46158 au 
 T_jup = 3.585 
[ 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 13.86   n/a E2021B10  
rotation period rot_per 11.6705 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

13405 Dorisbillings           Discovered 1999 Sept. 21 by G. W. Billings at Calgary.
Doris Billings, née Dora Kawchuk (b. 1925), is the mother of the discoverer. Some of his earliest memories are of her fascination with space.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1999 ST1 = 1980 BM4 = 1985 SW3 = 1987 BO2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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