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18357 (1990 SR2)
Classification: Main-belt Asteroid          SPK-ID: 2018357
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1961923909797213 3.1487e-08  
a 2.1883327218319 5.213e-09 au
q 1.758998492876538 6.8671e-08 au
i 4.734628107986571 3.4666e-06 deg
node 32.40645641217873 3.6661e-05 deg
peri 280.1604383812301 3.7592e-05 deg
M 160.4126525067906 8.2485e-06 deg
tp 2458673.628656713100
(2019-Jul-09.12865671)
2.7055e-05 TDB
period 1182.410992021061
3.24
4.225e-06
1.157e-08
d
yr
n .3044626635148769 1.0879e-09 deg/d
Q 2.617666950787261 6.2357e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2037  
   data-arc span      15890 days (43.50 yr)  
   first obs. used      1977-09-08  
   last obs. used      2021-03-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48285  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:28  

Additional Information
 Earth MOID = .750852 au 
 Jupiter MOID = 2.66672 au 
 T_jup = 3.645 
[ 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 14.81   n/a E2021B10  
diameter diameter 2.894 km 0.665 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
rotation period rot_per 16.55 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:
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) Ap. J. Supp. Ser. 241, A6.]
geometric albedo albedo 0.235   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

18357 (1990 SR2)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SR2 = 1977 RA2 = 1990 SX28 = 1999 FX30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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