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2684 Douglas (1981 AH1)
Classification: Main-belt Asteroid          SPK-ID: 2002684
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 .04715343525396834 3.3732e-08  
a 3.052064070426846 1.5293e-08 au
q 2.908148764891011 1.065e-07 au
i 9.922757609448189 4.1632e-06 deg
node 150.7127442585446 2.3424e-05 deg
peri 112.1663523227686 5.3333e-05 deg
M 10.65813267427148 4.7374e-05 deg
tp 2458942.840945344987
(2020-Apr-03.34094534)
0.00025634 TDB
period 1947.551255944905
5.33
1.4638e-05
4.008e-08
d
yr
n .1848475098671212 1.3893e-09 deg/d
Q 3.195979375962682 1.6014e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2387  
   data-arc span      22121 days (60.56 yr)  
   first obs. used      1960-02-27  
   last obs. used      2020-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43056  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:41:04  

Additional Information
 Earth MOID = 1.91046 au 
 Jupiter MOID = 1.89266 au 
 T_jup = 3.212 
[ 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 11.6   n/a MPO337270  
diameter diameter 15.962 km 0.255 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.159   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2684 Douglas (1981 AH1)          Discovered 1981-Jan-03 by Thomas, N. G. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 AH1 = 1960 DE = 1972 NY = 1978 PO2 = 1978 RU4 = 1978 SE4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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