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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.
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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 |
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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 |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| comet total magnitude |
M1 |
5.5 |
|
n/a |
ICQ 2005 Handbook |
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| comet total magnitude slope |
K1 |
8.0 |
|
n/a |
ICQ 2005 Handbook |
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| comet nuclear magnitude |
M2 |
13.6 |
|
n/a |
ICQ 2005 Handbook |
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| comet nuclear magnitude slope |
K2 |
5.0 |
|
n/a |
ICQ 2005 Handbook |
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| 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 |
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| 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) |
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| 1P/Halley Discovered 1758-Dec-25 by Palitzsch, Johann Georg |
| First known observation: -239/05/00 |
| Reference: comet.dis | Last Updated: 2003-08-29 |
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[ 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 | |
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