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19181 (1991 SD1)
Classification: Main-belt Asteroid          SPK-ID: 2019181
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1304742623151 1.9685e-08  
a 2.551973772534013 1.0219e-08 au
q 2.219006877115155 4.851e-08 au
i 13.80378810159222 1.3192e-06 deg
node 132.199326170373 3.135e-06 deg
peri 91.94561954328317 9.0603e-06 deg
M 174.9880326811608 1.0067e-05 deg
tp 2458476.699990097547
(2018-Dec-24.19999010)
3.9569e-05 TDB
period 1489.061849387463
4.08
8.9443e-06
2.449e-08
d
yr
n .241762959777721 1.4522e-09 deg/d
Q 2.884940667952872 1.1553e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1882  
   data-arc span      10776 days (29.50 yr)  
   first obs. used      1991-09-05  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46881  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:48:07  

Additional Information
 Earth MOID = 1.26051 au 
 Jupiter MOID = 2.23719 au 
 T_jup = 3.388 
[ 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 13.91   n/a E2021B10  
diameter diameter 4.639 km 0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.12791 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.248   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19181 (1991 SD1)          Discovered 1991-Sep-30 by McNaught, R. H. at Siding Spring
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 SD1 = 1998 GN4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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