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1798 Watts (1949 GC)
Classification: Main-belt Asteroid          SPK-ID: 2001798
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1224475132372382 3.7282e-08  
a 2.199033902233969 6.0655e-09 au
q 1.929767669381039 8.0302e-08 au
i 6.19247416431535 3.735e-06 deg
node 44.25885475760997 4.1249e-05 deg
peri 4.312782420258205 4.5997e-05 deg
M 78.27355614480018 1.9534e-05 deg
tp 2458741.524381667926
(2019-Sep-15.02438167)
6.4551e-05 TDB
period 1191.094760369339
3.26
4.928e-06
1.349e-08
d
yr
n .3022429549504272 1.2505e-09 deg/d
Q 2.468300135086898 6.8082e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2133  
   data-arc span      31209 days (85.45 yr)  
   first obs. used      1934-11-15  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47073  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:30:22  

Additional Information
 Earth MOID = .939749 au 
 Jupiter MOID = 2.87341 au 
 T_jup = 3.649 
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Orbital Elements at Epoch 2456167.5 (2012-Aug-28.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1220598539356159 3.7379e-08  
q 1.930398757366733 8.0453e-08 au
tp 2456358.632967814334
(2013-Mar-07.13296781)
6.478e-05 TDB
node 44.30434003485456 4.1216e-05 deg
peri 4.152865485594389 4.5995e-05 deg
i 6.195965047989096 3.7369e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2133  
   data-arc span      31209 days (85.45 yr)  
   first obs. used      1934-11-15  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47073  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:30:22  

Additional Information
 Jupiter MOID = 2.87341 au 
 T_jup = 3.649 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.397176746177785E-15 -3.001497472420734E-15 -4.395431055435957E-13 1.271346839979745E-15 -2.032924786621302E-13 5.659760822463834E-16
q -3.001497472420734E-15 6.472765597379938E-15 9.363504482771765E-13 -3.199327071512556E-15 4.324489281806991E-13 -1.112122653392692E-15
tp -4.395431055435957E-13 9.363504482771765E-13 4.196497072295495E-9 -7.194485518731545E-14 1.336944840657234E-9 -4.894658792315714E-12
node 1.271346839979745E-15 -3.199327071512556E-15 -7.194485518731545E-14 1.698778477850378E-9 -1.688367783668286E-9 -3.194895629439413E-11
peri -2.032924786621302E-13 4.324489281806991E-13 1.336944840657234E-9 -1.688367783668286E-9 2.115525949954067E-9 3.016506310338655E-11
i 5.659760822463834E-16 -1.112122653392692E-15 -4.894658792315714E-12 -3.194895629439413E-11 3.016506310338655E-11 1.396459707456287E-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 13.0   n/a MPO395009  
diameter diameter 6.631 km 0.186 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.5060 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pray, D.P.; Pravec, P.; Kucakova, H.; Vrastil, J.; et al. (2017) CBET 4374.]
geometric albedo albedo 0.294   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1798 Watts (1949 GC)          Discovered 1949-Apr-04 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1949 GC = 1934 VS = 1937 RL = 1970 YB = 1973 UD6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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