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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1596185450399102 3.3196e-08  
a 2.736380199528256 5.0899e-09 au
q 2.299603173403537 9.1184e-08 au
i 7.712781747404668 3.0708e-06 deg
node 103.1905104959998 2.5072e-05 deg
peri 129.0123849281028 2.6707e-05 deg
M 42.89346233463488 9.1045e-06 deg
tp 2459003.506594282559
(2020-Jun-03.00659428)
4.1585e-05 TDB
period 1653.343474700461
4.53
4.6131e-06
1.263e-08
d
yr
n .2177405998866762 6.0753e-10 deg/d
Q 3.173157225652975 5.9024e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3453  
   data-arc span      46599 days (127.58 yr)  
   first obs. used      1893-03-12  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .427  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:13:10  

Additional Information
 Earth MOID = 1.29617 au 
 Jupiter MOID = 1.85956 au 
 T_jup = 3.320 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455583.5 (2011-Jan-22.0) TDB
Reference: JPL 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622667463217438 3.3299e-08  
q 2.290371369068951 9.1778e-08 au
tp 2455697.336448026782
(2011-May-15.83644803)
3.7321e-05 TDB
node 103.2465222783038 2.5062e-05 deg
peri 128.6028356974735 2.6628e-05 deg
i 7.716914102752721 3.0766e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3453  
   data-arc span      46599 days (127.58 yr)  
   first obs. used      1893-03-12  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .427  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:13:10  

Additional Information
 Jupiter MOID = 1.85956 au 
 T_jup = 3.320 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.108809835651235E-15 -3.052638198177812E-15 4.300383855396848E-14 -1.180912189166616E-14 3.226235338873469E-14 -3.134648718217531E-15
q -3.052638198177812E-15 8.423198391585922E-15 -8.714511404623051E-14 3.282909715173697E-14 -8.317790591900911E-14 8.721974609975374E-15
tp 4.300383855396848E-14 -8.714511404623051E-14 1.392886438123329E-9 -6.015848699731162E-13 3.492463288286113E-10 -7.310764902212842E-14
node -1.180912189166616E-14 3.282909715173697E-14 -6.015848699731162E-13 6.281133084930219E-10 -6.223606677983505E-10 -2.774140413194574E-11
peri 3.226235338873469E-14 -8.317790591900911E-14 3.492463288286113E-10 -6.223606677983505E-10 7.090373775661364E-10 2.74493962679942E-11
i -3.134648718217531E-15 8.721974609975374E-15 -7.310764902212842E-14 -2.774140413194574E-11 2.74493962679942E-11 9.465302967988826E-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 21:38 < 00:01 Jupiter 1.89896721202622 1.89896680841355 1.89896761563954 1.94832616929521 1.70407960620886 2416716.401176739 0.950178707418684 115.900130305666 13.8655773136342 84.155338837719 3183622.14034318 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
1941-May-08 10:15 < 00:01 Jupiter 1.87218882888224 1.87218850215815 1.87218915560633 2.11129850586183 1.88486977604621 2430122.927375076 0.618688142912214 81.5798861485554 15.976955806228 -80.0466627573671 2544298.06336468 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
1999-Sep-06 23:35 < 00:01 Jupiter 1.88616531673289 1.8861650273028 1.88616560616287 1.90628787622346 1.654022695962 2451428.482828716 0.184598267333356 76.8511793225592 17.8752934479662 87.631386828208 3160401.54621367 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
2036-May-21 06:32 < 00:01 Jupiter 1.88875863489775 1.88875833605398 1.88875893374153 2.23359476590893 2.02287823768724 2464834.771928853 0.249369761751099 73.6964576109033 12.1941296505687 -80.1357330258913 2820564.33216783 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
2094-Sep-20 23:41 < 00:01 Jupiter 1.87800495431469 1.87800464211883 1.87800526651076 1.90566098114477 1.65211947268668 2486141.486648668 0.733607517907783 112.598405167535 19.8732463290861 -87.8809038941938 3041193.90871034 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
2131-Jun-03 14:01 00:01 Jupiter 1.89847631015822 1.89847588777464 1.89847673254191 2.33211891711424 2.13224304730516 2499545.083991678 1.01412089325044 72.8983760509229 10.7797274950608 -81.154156203938 2252421.43676209 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13
2189-Oct-06 19:34 00:02 Jupiter 1.86349918790895 1.8634988094391 1.86349956638124 1.91060919728041 1.65570553646625 2520855.315340642 1.54454646018491 179.485778082425 21.800928646862 -85.5254581891969 2884655.38018748 T 86 CATAB v2.0f-lin.ifort 2021-Apr-12 11:13:40 2021-Apr-12 11:13

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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