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1P/Halley
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000036
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2449400.5 (1994-Feb-17.0) TDB
Reference: JPL J863/77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.967142908462304 5.035e-09  
a 17.8341442925537 3.8913e-08 AU
q 0.585978111516909 8.8924e-08 AU
i 162.262690579161 6.7791e-06 deg
node 58.42008097656843 9.0539e-06 deg
peri 111.3324851045177 1.1714e-05 deg
M 38.3842644764388 1.4226e-07 deg
tp 2446467.395317050925
(1986-Feb-05.89531705)
4.7896e-06 JED
period 27509.1290731861
75.32
9.0034e-05
2.465e-07
d
yr
n .01308656479244564 4.2831e-11 deg/d
Q 35.08231047359043 7.6546e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.696463929511566E-10 3.084E-11
A2 [EST] 1.554613388970244E-10 3.205E-15
S0 [EST] 861.6729585598083 16.03
  Orbit Determination Parameters
   # obs. used (total)      7428  
   data-arc span      57852 days (158.39 yr)  
   first obs. used      1835-08-21  
   last obs. used      1994-01-11  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   fit RMS      1.0147  
   data source      ORB  
   producer      M.S.W. Keesey  
   solution date      2001-Aug-02 13:51:39  

Additional Information
 Earth MOID = .0637815 AU 
 T_jup = -0.605 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 5.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 8.0   n/a ICQ 2005 Handbook  
comet nuclear magnitude M2 13.6 mag n/a ICQ 2005 Handbook  
comet nuclear magnitude slope K2 5.0   n/a ICQ 2005 Handbook  
comet nuclear phase coefficient PC 0.03   n/a ICQ 2005 Handbook  
diameter diameter 11.0 km n/a Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264  
extent extent 14.9x8.2 km n/a Keller et al. (1987) Astron. Astrophys. 187:807-823 measurements repeatable within 100 to 200 meters
geometric albedo albedo 0.04   0.01 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)  

1P/Halley          Discovered 1758-Dec-25 by Palitzsch, Johann Georg
First known observation: -239/05/00
Reference: comet.disLast 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
1910-May-02 20:47 < 00:01 Venus 0.147167589975947 0.147167345236915 0.147167834715014 84.9101287026008 84.9099549234294 2418794.36603 0.00953971242863791 13.6790749364784 10.1372145102663 -43.6086536647272 1883466.54557164 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
1910-May-20 12:49 < 00:01 Earth 0.151350148507397 0.151349737057533 0.151350559957257 70.5589506679726 70.5587011636023 2418812.0347 0.0104633646334207 20.2914496520197 7.79792677371352 0.197546573093835 1101887.51170251 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
2060-Sep-09 14:59 < 00:01 Jupiter 0.983504828967693 0.983503705114857 0.983505952820578 27.6164884473074 27.5852855134743 2473712.12486 0.140543347218641 30.2569571872965 22.9046371376127 -73.7392659285477 2657920.1451003 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
2061-Aug-20 04:38 < 00:01 Venus 0.0543634626366865 0.0543631173901189 0.0543638079431018 78.8519122031059 78.8514056196421 2474056.69356 0.0784865017798449 95.6796969500035 5.4733542802681 80.2745164061932 1451092.65083635 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
2134-Apr-09 13:28 < 00:01 Venus 0.143577395646832 0.143564578499495 0.143590212846259 84.6662904212106 84.6661117836377 2500586.06124 0.787096786488986 650.133839943804 5.05942937860065 -12.2920099159751 896532.830327878 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
2134-May-07 12:15 < 00:01 Earth 0.0915871578273221 0.0915757041878453 0.0915986143119548 65.2797689446838 65.2793232877726 2500614.01071 0.75546018241811 972.024983551302 14.6594671296254 -54.6780348236826 751319.823865228 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48
2135-Feb-02 06:27 < 00:01 Jupiter 1.99459945584106 1.99459426887733 1.99460464282887 27.1250707452102 27.1094106725375 2500884.76896 0.965470818676822 233.773512946167 20.1000495648132 47.2696952871907 4537526.60755037 T J863/77 CATAB v2.0a-linF95 2006-Mar-28 12:48:22 2006-Mar-28 12:48

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1986.1   1P/1982 U1   1986 III   1982i 
 1910.8   1P/1909 R1   1910 II   1909c 
 1835.5   1P/1835 P1   1835 III   
 1760.1   1P/1758 Y1   1759 I   
 1684.8   1P/1682 Q1   1682    
 1609.5   1P/1607 S1   1607    
 1534.2   1P/1531 P1   1531    
 1458.9   1P/1456 K1   1456    
 1383.5   1P/1378 S1   1378    
 1308.2   1P/1301 R1   1301    
 1232.9   1P/1222 R1   1222    
 1157.6   1P/1145 G1   1145    
 1082.3   1P/1066 G1   1066    
 1007.0   1P/ 989 N1    989    
 931.6   1P/ 912 J1    912    
 856.3   1P/ 837 F1    837    
 781.0   1P/ 760 K1    760    
 705.7   1P/ 684 R1    684    
 630.4   1P/ 607 H1    607    
 555.1   1P/ 530 Q1    530    
 479.7   1P/ 451 L1    451    
 404.4   1P/ 374 E1    374    
 329.1   1P/ 295 J1    295    
 253.8   1P/ 218 H1    218    
 178.5   1P/ 141 F1    141    
 103.2   1P/  66 B1     66    
 -47.5   1P/ -11 Q1    -11    
 -122.8   1P/ -86 Q1    -86    
 -198.1   1P/-163 U1   -163    
 -273.4   1P/-239 K1   -239    
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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