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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0477489798427727 3.3475e-08  
a 3.052571099312674 1.6032e-08 au
q 2.906813943422963 1.0623e-07 au
i 9.932901862490247 4.1562e-06 deg
node 150.6704050376607 2.3256e-05 deg
peri 111.379107752379 5.2663e-05 deg
M 48.35314212847208 4.6666e-05 deg
tp 2458938.850861340020
(2020-Mar-30.35086134)
0.0002527 TDB
period 1948.036586067652
5.33
1.5347e-05
4.202e-08
d
yr
n .1848014573107704 1.4559e-09 deg/d
Q 3.198328255202385 1.6798e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2426  
   data-arc span      22196 days (60.77 yr)  
   first obs. used      1960-02-27  
   last obs. used      2020-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42762  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:04:49  

Additional Information
 Earth MOID = 1.90774 au 
 Jupiter MOID = 1.88873 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 11.68   n/a E2021B10  
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1904-Nov-14 03:48 00:03 Jupiter 1.89285781371349 1.89285734830829 1.8928582791202 3.38657857821 3.25176069185064 2416798.658024855 2.51326355796446 152.040584593462 14.9177993150347 81.9301148118531 3238344.8928109 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
1953-Apr-24 06:30 00:01 Jupiter 1.96416275764268 1.96416226655488 1.96416324873071 2.94565945225836 2.79543068162896 2434491.771164494 1.450618737709 58.9751476910426 10.553480666456 71.7996675015753 3877840.74598131 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
1962-Oct-25 09:57 00:01 Jupiter 1.95898409566904 1.95898368095826 1.95898451038004 4.30957920217714 4.20805370577673 2437962.914838172 1.10837906154688 85.7318024219508 16.8962099082071 -84.6931726048225 4029644.49972657 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
2011-Mar-10 04:23 < 00:01 Jupiter 1.89032283626297 1.89032244355475 1.89032322897118 3.69598400697287 3.57269236488197 2455630.682672690 0.185970323937633 33.5165062250014 16.2051302138523 80.899661152004 3424041.88105436 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
2059-Aug-11 02:15 00:01 Jupiter 1.92579996094265 1.92579954328532 1.9258003786001 3.03078929073325 2.88201767621504 2473316.593945706 1.12287102825992 63.5578506404173 12.5228907680151 78.119734405554 3438511.83597944 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
2117-Jul-08 03:12 00:02 Jupiter 1.92372188209655 1.92372131863751 1.92372244555842 4.03828423228711 3.92773872113222 2494466.633294056 2.30029561360099 169.887852254472 17.3775014737049 -84.8435208822837 3634390.07200174 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04
2165-Nov-30 18:57 00:04 Jupiter 1.9119524326206 1.91195200753971 1.91195285770256 3.29800562346168 3.16082461293898 2512144.289500177 3.56555043212726 207.808409964063 15.0334505188789 84.0331020712263 3205701.95808483 T 40 CATAB v2.0f-lin.ifort 2021-Feb-24 01:04:56 2021-Feb-24 01:04

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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