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21445 Pegconnolly (1998 HG17)
Classification: Main-belt Asteroid          SPK-ID: 2021445
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1935216000512232 2.9239e-08  
a 2.282108819192616 6.322e-09 au
q 1.840471469011453 6.8906e-08 au
i 5.525657466874389 3.0345e-06 deg
node 216.8879900709287 3.3615e-05 deg
peri 176.8081113270678 3.4637e-05 deg
M 38.8815401825816 8.7754e-06 deg
tp 2459260.498433720392
(2021-Feb-14.99843372)
3.0533e-05 TDB
period 1259.223879268869
3.45
5.2325e-06
1.433e-08
d
yr
n .2858903852816255 1.188e-09 deg/d
Q 2.723746169373778 7.5455e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2080  
   data-arc span      23822 days (65.22 yr)  
   first obs. used      1955-11-24  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48831  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:17  

Additional Information
 Earth MOID = .846231 au 
 Jupiter MOID = 2.70851 au 
 T_jup = 3.574 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457670.5 (2016-Oct-09.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1949181212480373 2.9278e-08  
q 1.836775607469177 6.9084e-08 au
tp 2458001.338598113693
(2017-Sep-04.83859811)
2.9104e-05 TDB
node 216.9582149010017 3.3572e-05 deg
peri 176.780697387332 3.4575e-05 deg
i 5.530157889747909 3.0369e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2080  
   data-arc span      23822 days (65.22 yr)  
   first obs. used      1955-11-24  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48831  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:17  

Additional Information
 Jupiter MOID = 2.70851 au 
 T_jup = 3.574 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.571861575269352E-16 -2.017975309417841E-15 -1.437387466341064E-13 5.850862913309553E-15 -2.313165851372224E-14 -1.365305580846717E-15
q -2.017975309417841E-15 4.772608216958054E-15 3.445509566133606E-13 -1.285786440506246E-14 5.37558553731449E-14 3.342657759476672E-15
tp -1.437387466341064E-13 3.445509566133606E-13 8.470285920598049E-10 3.168754964239507E-12 2.494176788642222E-10 1.614136968284723E-12
node 5.850862913309553E-15 -1.285786440506246E-14 3.168754964239507E-12 1.127111730539375E-9 -1.120504398850042E-9 -1.403099005554171E-11
peri -2.313165851372224E-14 5.37558553731449E-14 2.494176788642222E-10 -1.120504398850042E-9 1.195397557140446E-9 1.439507324096997E-11
i -1.365305580846717E-15 3.342657759476672E-15 1.614136968284723E-12 -1.403099005554171E-11 1.439507324096997E-11 9.222787630616938E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.62   n/a E2021B10  
diameter diameter 3.127 km 0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.301   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21445 Pegconnolly           Discovered 1998 Apr. 18 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Peggy Connolly mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Illinois Mathematics and Science Academy, Aurora, Illinois.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

Alternate Designations
 1998 HG17 = 2000 VP36 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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