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25924 Douglasadams (2001 DA42)
Classification: Main-belt Asteroid          SPK-ID: 2025924
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1665468800006106 2.9207e-08  
a 2.415726731527428 9.3374e-09 au
q 2.013394981457462 7.2977e-08 au
i 1.726957936774318 4.198e-06 deg
node 307.2453936212942 0.0001241 deg
peri 313.5899341776096 0.00012495 deg
M 57.88201835861843 1.4621e-05 deg
tp 2459175.998625820086
(2020-Nov-22.49862582)
5.563e-05 TDB
period 1371.418913088913
3.75
7.9513e-06
2.177e-08
d
yr
n .2625018486795948 1.522e-09 deg/d
Q 2.818058481597394 1.0893e-08 au
  Orbit Determination Parameters
   # obs. used (total)      918  
   data-arc span      8919 days (24.42 yr)  
   first obs. used      1997-01-09  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55485  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 19:13:38  

Additional Information
 Earth MOID = .998464 au 
 Jupiter MOID = 2.2484 au 
 T_jup = 3.497 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457010.5 (2014-Dec-19.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1668476908661311 2.9254e-08  
q 2.011516822905622 7.2943e-08 au
tp 2456433.864362172103
(2013-May-21.36436217)
5.6897e-05 TDB
node 307.3263732378614 0.00012386 deg
peri 313.4410221470132 0.00012472 deg
i 1.729513804041097 4.1999e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      918  
   data-arc span      8919 days (24.42 yr)  
   first obs. used      1997-01-09  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55485  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 19:13:38  

Additional Information
 Jupiter MOID = 2.2484 au 
 T_jup = 3.497 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.557695941249171E-16 -2.122781449596814E-15 3.27423783364325E-13 2.79045764071393E-15 7.733532504994646E-14 1.495846413895832E-16
q -2.122781449596814E-15 5.320609182367755E-15 -8.926665566618959E-13 -7.060038849803035E-15 -2.065684390914023E-13 -2.648165696174892E-16
tp 3.27423783364325E-13 -8.926665566618959E-13 3.237311955571118E-9 -1.063180636044713E-11 8.416851150925931E-10 1.169659372976424E-13
node 2.79045764071393E-15 -7.060038849803035E-15 -1.063180636044713E-11 1.534203750466031E-8 -1.533738353068707E-8 1.659819149212568E-10
peri 7.733532504994646E-14 -2.065684390914023E-13 8.416851150925931E-10 -1.533738353068707E-8 1.555414200051682E-8 -1.658653721977594E-10
i 1.495846413895832E-16 -2.648165696174892E-16 1.169659372976424E-13 1.659819149212568E-10 -1.658653721977594E-10 1.763910024705037E-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 15.63   n/a E2021B10  
diameter diameter 2.410 km 0.528 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.210   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

25924 Douglasadams           Discovered 2001 Feb. 19 by LINEAR at Socorro.
The provisional designation of this object is singularly appropriate to honor Douglas Adams (1952-2001), author of The Hitchhiker's Guide to the Galaxy. In their cosmic travels following the earth's destruction, his two protagonists ascertained that the answer to Life, the Universe and Everything was the number 42.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050125/MPCPages.arcLast Updated: 2005-06-01

Alternate Designations
 2001 DA42 = 1999 VX149 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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