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1P/Halley
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000036
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | 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 TDB
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  
   norm. resid. RMS      1.0147  
   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 
[ hide covariance matrix ]
Orbit Covariance (9×9)
  e q tp node peri i A1 A2 S0
e 2.535130042064448E-17 -4.477069221957611E-16 2.244742109954339E-15 -1.152632301301374E-15 -3.428746110486877E-14 -1.37363384923585E-15 1.453561247679382E-19 1.108452185532509E-23 -6.642834722892528E-9
q -4.477069221957611E-16 7.907423377076052E-15 -3.982775923743366E-14 1.683104814399934E-14 6.003562999126546E-13 2.062958634925452E-14 -2.562861115100511E-18 -1.938635170775376E-22 1.196172808158651E-7
tp 2.244742109954339E-15 -3.982775923743366E-14 2.294013304222565E-11 -1.344753787978788E-12 4.529284394849011E-12 2.225228372466568E-12 2.020718185992114E-17 3.78742532019169E-21 -1.045700125684269E-6
node -1.152632301301374E-15 1.683104814399934E-14 -1.344753787978788E-12 8.197263646377595E-11 7.794553311836263E-11 3.217070293291721E-11 -5.531568906499662E-18 -1.007176163588689E-20 -4.605567139563392E-6
peri -3.428746110486877E-14 6.003562999126546E-13 4.529284394849011E-12 7.794553311836263E-11 1.372088204478606E-10 3.365846087159344E-11 -2.267577212298162E-16 -2.441966219381977E-20 7.968994951124546E-6
i -1.37363384923585E-15 2.062958634925452E-14 2.225228372466568E-12 3.217070293291721E-11 3.365846087159344E-11 4.595620606942406E-11 -6.948112956182598E-18 -1.033058800976034E-20 4.082251421291546E-6
A1 1.453561247679382E-19 -2.562861115100511E-18 2.020718185992114E-17 -5.531568906499662E-18 -2.267577212298162E-16 -6.948112956182598E-18 9.510454861022018E-22 7.205403001127331E-26 -7.071102159408442E-11
A2 1.108452185532509E-23 -1.938635170775376E-22 3.78742532019169E-21 -1.007176163588689E-20 -2.441966219381977E-20 -1.033058800976034E-20 7.205403001127331E-26 1.027419726777424E-29 -9.445951173849719E-16
S0 -6.642834722892528E-9 1.196172808158651E-7 -1.045700125684269E-6 -4.605567139563392E-6 7.968994951124546E-6 4.082251421291546E-6 -7.071102159408442E-11 -9.445951173849719E-16 257.056788836146

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 5.5   n/a ICQ 2005 Handbook  
comet total magnitude slope K1 8.0   n/a ICQ 2005 Handbook  
comet nuclear magnitude M2 13.6   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

[ show close-approach data ]
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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