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19694 Dunkelman (1999 RX230)
Classification: Outer Main-belt Asteroid          SPK-ID: 2019694
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08222056777706782 3.7039e-08  
a 3.550533868851016 2.497e-08 au
q 3.258606958242376 1.2219e-07 au
i 12.28425299475517 3.515e-06 deg
node 121.1034182640176 1.9993e-05 deg
peri 195.9151282671991 3.3716e-05 deg
M 132.081039247113 2.815e-05 deg
tp 2458499.945090293082
(2019-Jan-16.44509029)
0.00018973 TDB
period 2443.649514981731
6.69
2.5779e-05
7.058e-08
d
yr
n .1473206357101875 1.5541e-09 deg/d
Q 3.842460779459656 2.7023e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1958  
   data-arc span      14309 days (39.18 yr)  
   first obs. used      1982-01-30  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:15:06  

Additional Information
 Earth MOID = 2.24599 au 
 Jupiter MOID = 1.43443 au 
 T_jup = 3.074 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457481.5 (2016-Apr-03.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08481163747669472 3.7997e-08  
q 3.255921231913235 1.2697e-07 au
tp 2458477.905556550610
(2018-Dec-25.40555655)
0.00018277 TDB
node 121.5449196676616 1.992e-05 deg
peri 192.0711237473287 3.2706e-05 deg
i 12.30967507098586 3.5152e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1958  
   data-arc span      14309 days (39.18 yr)  
   first obs. used      1982-01-30  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:15:06  

Additional Information
 Jupiter MOID = 1.43443 au 
 T_jup = 3.074 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.443800055772659E-15 -4.759840433619789E-15 9.498642417632602E-13 3.528987084827215E-15 5.850766638744787E-14 5.506328929781098E-16
q -4.759840433619789E-15 1.612160714857704E-14 -2.304771304054837E-12 1.313014570630294E-15 -1.120150549642995E-13 -2.833669999175885E-15
tp 9.498642417632602E-13 -2.304771304054837E-12 3.340379077791056E-8 -2.900507044798799E-11 4.760014719893082E-9 -3.706258706463003E-12
node 3.528987084827215E-15 1.313014570630294E-15 -2.900507044798799E-11 3.968241925184932E-10 -3.920264338876514E-10 -9.644846089791977E-12
peri 5.850766638744787E-14 -1.120150549642995E-13 4.760014719893082E-9 -3.920264338876514E-10 1.069672985512849E-9 8.747759087499486E-12
i 5.506328929781098E-16 -2.833669999175885E-15 -3.706258706463003E-12 -9.644846089791977E-12 8.747759087499486E-12 1.235672128789054E-11

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 12.74   n/a MPCxxxxx  
diameter diameter 15.320 km 0.227 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.083   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19694 Dunkelman           Discovered 1999 Sept. 8 by Catalina Sky Survey.
Lawrence Dunkelman (b. 1917), of the Naval Research Laboratory and NASA Goddard Space Flight Center, measured the solar near-ultraviolet spectral distribution from Mt. Lemmon in 1952 and helped advise the Mercury astronauts on observations of the upper atmosphere and space phenomena from orbit.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020328/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1999 RX230 = 1982 BN15 = 1998 MB29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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