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39481 (1981 DP1)
Classification: Main-belt Asteroid          SPK-ID: 2039481
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1319213532246513 3.3564e-08  
a 2.307323303190898 9.1294e-09 au
q 2.002938090707182 8.0513e-08 au
i 6.675142287746382 3.8288e-06 deg
node 247.7707922994785 3.3077e-05 deg
peri 48.047013939459 3.7264e-05 deg
M 24.26547041484262 1.5579e-05 deg
tp 2459114.212612606395
(2020-Sep-21.71261261)
5.548e-05 TDB
period 1280.150721607156
3.50
7.5978e-06
2.08e-08
d
yr
n .281216886358538 1.669e-09 deg/d
Q 2.611708515674613 1.0334e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1104  
   data-arc span      14433 days (39.52 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51777  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:21:07  

Additional Information
 Earth MOID = .992089 au 
 Jupiter MOID = 2.55572 au 
 T_jup = 3.566 
[ 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 15.28   n/a E2021B10  
diameter diameter 1.851 km 0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.05356 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.325   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39481 (1981 DP1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 DP1 = 1999 LA26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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