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638 Moira (A917 RC)
Classification: Main-belt Asteroid          SPK-ID: 2000638
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1596185467835806 3.3287e-08  
a 2.736380199602998 5.0933e-09 au
q 2.299603168695003 9.1421e-08 au
i 7.712781798873063 3.0732e-06 deg
node 103.1905092845424 2.5202e-05 deg
peri 129.0123854729744 2.6836e-05 deg
M 42.89346283638805 9.1159e-06 deg
tp 2459003.506591970126
(2020-Jun-03.00659197)
4.1639e-05 TDB
period 1653.343474768201
4.53
4.6161e-06
1.264e-08
d
yr
n .217740599877755 6.0793e-10 deg/d
Q 3.173157230510993 5.9063e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3438  
   data-arc span      46599 days (127.58 yr)  
   first obs. used      1893-03-12  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-23 18:13:17  

Additional Information
 Earth MOID = 1.29617 au 
 Jupiter MOID = 1.85956 au 
 T_jup = 3.320 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455573.5 (2011-Jan-12.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .162268888203809 3.3389e-08  
q 2.290365892911947 9.2014e-08 au
tp 2455697.340825329942
(2011-May-15.84082533)
3.7391e-05 TDB
node 103.2468301753838 2.5192e-05 deg
peri 128.6039512382981 2.6756e-05 deg
i 7.716912119546298 3.079e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3438  
   data-arc span      46599 days (127.58 yr)  
   first obs. used      1893-03-12  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-23 18:13:17  

Additional Information
 Jupiter MOID = 1.85956 au 
 T_jup = 3.320 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.114828527054823E-15 -3.068782484133634E-15 3.737150951067266E-14 -1.199113720879849E-14 3.067646271836291E-14 -3.145305320994732E-15
q -3.068782484133634E-15 8.466506075069956E-15 -7.207960924465133E-14 3.333522870158512E-14 -7.895148970556051E-14 8.749602186095545E-15
tp 3.737150951067266E-14 -7.207960924465133E-14 1.398067958607287E-9 -5.11907220936939E-13 3.507870393094875E-10 -5.957433161863767E-14
node -1.199113720879849E-14 3.333522870158512E-14 -5.11907220936939E-13 6.346340244106545E-10 -6.287925545027972E-10 -2.805045055788608E-11
peri 3.067646271836291E-14 -7.895148970556051E-14 3.507870393094875E-10 -6.287925545027972E-10 7.158938962008593E-10 2.775980762999992E-11
i -3.145305320994732E-15 8.749602186095545E-15 -5.957433161863767E-14 -2.805045055788608E-11 2.775980762999992E-11 9.480044549501409E-12

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 10.10   n/a E2021B10  
diameter diameter 59.594 km 0.387 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.8768 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.060   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

638 Moira (A917 RC)          Discovered 1907-May-05 by Metcalf, J. H. at Taunton
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
1904-Aug-23 21:37 < 00:01 Jupiter 1.89896721940699 1.89896681527154 1.89896762354308 1.94832638850568 1.70407985641023 2416716.401025082 0.950280923106769 116.0082084449 13.9267942117218 84.165923377851 3169412.3282397 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
1941-May-08 10:15 < 00:01 Jupiter 1.87218875537471 1.87218842808798 1.87218908266144 2.11129829224265 1.8848695260148 2430122.927299404 0.618705576577263 81.766536596633 16.0345897563848 -80.0135924793024 2538544.78533919 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
1999-Sep-06 23:35 < 00:01 Jupiter 1.88616526310349 1.88616497230222 1.88616555390465 1.90628786538744 1.65402267425381 2451428.482843453 0.184795507810739 77.1679966649657 17.9519320189513 87.632655350179 3144235.77791272 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
2036-May-21 06:32 < 00:01 Jupiter 1.88875861311953 1.8887583140446 1.88875891219456 2.23359478197093 2.02287825164148 2464834.771929109 0.250132001042768 73.8169503815235 12.2396761991876 -80.1013771931467 2816525.54609485 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
2094-Sep-20 23:41 < 00:01 Jupiter 1.87800488048021 1.8780045664952 1.87800519446544 1.90566095091746 1.6521194255795 2486141.486699242 0.734384651205253 113.005439808988 19.9669474253773 -87.9020793872317 3024294.37923858 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
2131-Jun-03 14:01 00:01 Jupiter 1.8984763128642 1.89847589047598 1.89847673525253 2.33211899163005 2.13224312794838 2499545.084015342 1.01498175366781 72.9507652902629 10.8247676867442 -81.1246581666173 2250502.64826143 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13
2189-Oct-06 19:34 00:02 Jupiter 1.86349910268942 1.86349872251521 1.86349948286607 1.91060935200205 1.65570570093715 2520855.315532370 1.54521357628634 179.861372579006 21.9050531984897 -85.5387501099532 2870124.77867108 T 85 CATAB v2.0f-lin.ifort 2021-Feb-23 18:13:26 2021-Feb-23 18:13

Alternate Designations
 A917 RC = 1944 QJ = 1976 WA1 = A893 EB = A906 BF = A907 JG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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