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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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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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225477009616334 3.7135e-08  
a 2.198731539338844 5.9951e-09 au
q 1.929282044161035 7.9978e-08 au
i 6.192821676647626 3.6974e-06 deg
node 44.25378496576847 4.085e-05 deg
peri 4.260094927671795 4.5462e-05 deg
M 138.7815870114547 1.929e-05 deg
tp 2458741.422418788192
(2019-Sep-14.92241879)
6.3632e-05 TDB
period 1190.849108985979
3.26
4.8705e-06
1.333e-08
d
yr
n .3023053023959887 1.2364e-09 deg/d
Q 2.468181034516652 6.7298e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2290  
   data-arc span      31477 days (86.18 yr)  
   first obs. used      1934-11-15  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:14  

Additional Information
 Earth MOID = .938351 au 
 Jupiter MOID = 2.87411 au 
 T_jup = 3.649 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456342.5 (2013-Feb-19.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .122209153127306 3.7196e-08  
q 1.930347775300331 8.0128e-08 au
tp 2456358.606403363647
(2013-Mar-07.10640336)
6.3716e-05 TDB
node 44.30502373765704 4.082e-05 deg
peri 4.144956010646724 4.5461e-05 deg
i 6.195702923900318 3.6988e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2290  
   data-arc span      31477 days (86.18 yr)  
   first obs. used      1934-11-15  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:14  

Additional Information
 Jupiter MOID = 2.87411 au 
 T_jup = 3.649 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.383538143336377E-15 -2.974835814882159E-15 -4.024598442998056E-13 1.602775715728644E-15 -1.910356594969762E-13 5.18343360886896E-16
q -2.974835814882159E-15 6.420452158400843E-15 8.587197979798162E-13 -3.668741457657195E-15 4.071624806638791E-13 -1.021024502283186E-15
tp -4.024598442998056E-13 8.587197979798162E-13 4.059689559650366E-9 -8.971376142368653E-15 1.289318886002534E-9 -4.595282774405746E-12
node 1.602775715728644E-15 -3.668741457657195E-15 -8.971376142368653E-15 1.666242812262004E-9 -1.656026623635645E-9 -3.190499466364411E-11
peri -1.910356594969762E-13 4.071624806638791E-13 1.289318886002534E-9 -1.656026623635645E-9 2.0667039126125E-9 3.022398698628777E-11
i 5.18343360886896E-16 -1.021024502283186E-15 -4.595282774405746E-12 -3.190499466364411E-11 3.022398698628777E-11 1.368116254873706E-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 13.03   n/a E2021B10  
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. 2020-October); 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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