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991 McDonalda (A922 UC)
Classification: Main-belt Asteroid          SPK-ID: 2000991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1594062534300184 2.9864e-08  
a 3.13936081375573 1.1976e-08 au
q 2.638927068269915 9.8198e-08 au
i 2.069528447347803 3.2479e-06 deg
node 63.2343423417676 9.0545e-05 deg
peri 254.7832608288123 9.1128e-05 deg
M 309.2977614887167 1.1574e-05 deg
tp 2459682.644175048139
(2022-Apr-13.14417505)
6.5965e-05 TDB
period 2031.703254963895
5.56
1.1626e-05
3.183e-08
d
yr
n .1771912306191573 1.0139e-09 deg/d
Q 3.639794559241545 1.3885e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3616  
   data-arc span      31177 days (85.36 yr)  
   first obs. used      1936-02-20  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42965  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:49:13  

Additional Information
 Earth MOID = 1.626 au 
 Jupiter MOID = 1.66413 au 
 T_jup = 3.190 
[ 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 11.26   n/a E2021B10 IRAS observations used: 15
diameter diameter 38.556 km 0.514 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.040   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
B-V BV 0.660   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.11 deg.
U-B UB 0.370   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.11 deg.
Tholen spectral type spec_T C:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

991 McDonalda (A922 UC)          Discovered 1922-Oct-24 by Struve, O. at Williams Bay
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
1907-May-26 05:31 00:02 Jupiter 1.65357065869655 1.65357039718612 1.65357092020681 1.70055346854114 1.36653033301246 2417721.729635883 1.96173390323739 79.9979099725216 28.730284475846 -63.4113634615025 3300891.16892293 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
1917-Oct-22 07:04 00:02 Jupiter 1.78605942826246 1.78605871533629 1.78606014118853 2.63455624538131 2.44793887179149 2421523.794393274 1.7631730648666 51.4002388728802 7.23538435939012 -80.3913821162988 2243246.99082689 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
1991-Aug-21 02:32 < 00:01 Jupiter 1.76766422778789 1.76766388474825 1.76766457082733 1.89126402987985 1.61818644242136 2448489.605521685 0.474828667528336 48.045757929607 12.711215646102 -84.0469232860391 3222622.97846329 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2002-Jan-25 20:57 < 00:01 Jupiter 1.66142381372407 1.66142353971562 1.66142408773234 1.79287344310457 1.48147247474374 2452300.372603434 0.278392404744901 42.7575104683289 21.8388528242634 -80.4325600540422 3290643.00189278 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2012-Jun-25 03:32 < 00:01 Jupiter 1.85361604408901 1.85361572041701 1.85361636776102 3.02502563988724 2.86999415721044 2456103.647016751 0.173407769735391 29.6404922059867 9.83159636137428 -83.9164369093331 4142680.19215549 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2086-Apr-26 10:07 00:01 Jupiter 1.72791719980714 1.7279167339465 1.72791766566758 1.77716251161641 1.4757741990567 2483071.921525863 1.273391039243 60.339095627544 23.6511618887456 86.5330898305803 2565355.0892419 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2096-Sep-29 23:13 00:02 Jupiter 1.69545565897066 1.69545534239552 1.69545597554562 1.97746215013611 1.70622055010574 2486881.467380388 1.53176587319821 40.8750650812019 14.2289020103619 -79.31779967794 2851472.12655057 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2107-Mar-01 01:54 00:02 Jupiter 1.93120884335892 1.93120810543675 1.93120958128153 3.47076784815671 3.34201067412437 2490684.579036504 1.71705942523925 66.6356891486245 13.6185888436575 -69.3090081693548 3387075.04835995 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2170-Jul-18 16:49 00:03 Jupiter 1.92392199197069 1.92392085141915 1.92392313252301 2.38904480220212 2.19704769767066 2513835.200961036 2.7036287116286 102.492229435128 9.55763577379041 -79.6331313851451 2395420.36320413 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2180-Dec-29 22:11 00:03 Jupiter 1.69742908725779 1.6974284953738 1.69742967914285 1.7116535402928 1.38987462868184 2517652.424045213 2.9728254351849 114.325700079154 27.1808398973814 87.5795478547924 2903606.36963563 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49
2191-Jun-05 03:19 00:03 Jupiter 1.73838460116964 1.73838385256113 1.73838534977746 2.2208939268139 1.98944113521228 2521461.638524943 3.26824404317501 35.1739957363724 14.6201239963841 -87.1984718174126 1175164.85443112 T 46 CATAB v2.0g-lin.ifort 2021-Jul-08 11:49:49 2021-Jul-08 11:49

Alternate Designations
 A922 UC = 1949 PF = 1950 WG = 1953 GT1 = 1975 EE6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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