Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
1P/Halley
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000036
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]
Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


:
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

[ 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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Sep-01 11:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin