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19991 (1990 SW8)
Classification: Main-belt Asteroid          SPK-ID: 2019991
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1363645606000653 3.5034e-08  
a 2.78928754658017 1.2813e-08 au
q 2.408927575903531 9.6286e-08 au
i 12.07241265534999 4.1357e-06 deg
node 160.3652595265415 1.5055e-05 deg
peri 206.5495903254948 1.9621e-05 deg
M 170.670676706781 1.2961e-05 deg
tp 2458393.832112931128
(2018-Oct-02.33211293)
6.0487e-05 TDB
period 1701.525094692825
4.66
1.1725e-05
3.21e-08
d
yr
n .2115748989673235 1.4579e-09 deg/d
Q 3.16964751725681 1.4561e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2546  
   data-arc span      11148 days (30.52 yr)  
   first obs. used      1990-09-14  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44754  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:00:52  

Additional Information
 Earth MOID = 1.4106 au 
 Jupiter MOID = 2.2933 au 
 T_jup = 3.284 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457176.5 (2015-Jun-03.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340841824707376 3.4986e-08  
q 2.417045110457563 9.5779e-08 au
tp 2456684.784262751319
(2014-Jan-27.28426275)
6.1892e-05 TDB
node 160.4196056111698 1.504e-05 deg
peri 205.4832945863052 1.9793e-05 deg
i 12.0714433400688 4.138e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2546  
   data-arc span      11148 days (30.52 yr)  
   first obs. used      1990-09-14  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44754  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:00:52  

Additional Information
 Jupiter MOID = 2.2933 au 
 T_jup = 3.284 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.224010536740325E-15 -3.329248925724916E-15 -5.16433797049618E-13 3.205169196684107E-15 -1.172706220298645E-13 1.228274395727251E-15
q -3.329248925724916E-15 9.173658975923349E-15 1.384944354560575E-12 -8.592782467571972E-15 3.218534988913784E-13 -3.334144286315057E-15
tp -5.16433797049618E-13 1.384944354560575E-12 3.830645087482943E-9 -7.941896775126973E-12 8.04240449935803E-10 -3.437993150059418E-13
node 3.205169196684107E-15 -8.592782467571972E-15 -7.941896775126973E-12 2.262065153197759E-10 -2.227454372889671E-10 -3.313285993548182E-12
peri -1.172706220298645E-13 3.218534988913784E-13 8.04240449935803E-10 -2.227454372889671E-10 3.917575611573344E-10 3.14023352917555E-12
i 1.228274395727251E-15 -3.334144286315057E-15 -3.437993150059418E-13 -3.313285993548182E-12 3.14023352917555E-12 1.712327835404153E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.87   n/a E2021B10  
diameter diameter 4.531 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.96458 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.]
geometric albedo albedo 0.312   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19991 (1990 SW8)          Discovered 1990-Sep-22 by Elst, E. W. at La Silla
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SW8 = 1999 RK48 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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