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78P/Gehrels 2
Classification: Jupiter-family Comet          SPK-ID: 1000030
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456771.5 (2014-Apr-24.0) TDB
Reference: JPL K114/8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4619028596361237 9.5155e-08  
a 3.73590971838216 9.263e-08 AU
q 2.010282336119055 3.8944e-07 AU
i 6.253845264350978 1.0513e-05 deg
node 210.561210461237 2.4846e-05 deg
peri 192.7544368108993 3.9828e-05 deg
M 113.6399853231238 1.4481e-05 deg
tp 2455938.928282273713
(2012-Jan-12.42828227)
8.4563e-05 JED
period 2637.503142307025
7.22
9.8094e-05
2.686e-07
d
yr
n .1364927283783662 5.0764e-09 deg/d
Q 5.461537100645265 1.3542e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 7.973361440894842E-9 4.74E-11
A2 [EST] -3.216321567295403E-10 4.189E-11
A3 [EST] -4.613162981162791E-10 1.012E-10
DT [EST] -63.40103271807845 2.728
  Orbit Determination Parameters
   # obs. used (total)      5476  
   data-arc span      14794 days (40.50 yr)  
   first obs. used      1973-09-29  
   last obs. used      2014-04-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .62912  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Apr-14 08:45:22  

Additional Information
 Earth MOID = 1.01851 AU 
 T_jup = 2.887 
[ 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 6.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 14.0   n/a ICQ 2005 Handbook  

78P/Gehrels 2          Discovered 1973-Sep-29 by Gehrels, Tom
discovered on plate/photo taken on discovery date as well as 9/30, 10/4
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
1911-Oct-11 13:54 00:07 Jupiter 0.164090744802015 0.164080644900574 0.164100845120622 4.36207460009613 2.95023123555281 2419321.079509708 6.61870287949866 35.765503113701 8.35077125047927 43.4635582125698 144275.554937355 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
1934-Mar-27 07:12 00:01 Jupiter 1.62501594607391 1.62499224519165 1.62503964665474 7.39896077660267 7.32817450346893 2427523.800292476 1.12723916334766 254.872473569829 30.4946331179842 7.38523745781837 170519.496246937 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
1971-Jun-05 12:26 < 00:01 Jupiter 0.945254390219422 0.945248802799151 0.945259977631409 5.84715890892914 5.69184587834928 2441108.017777967 0.751714166491496 36.8787254344953 26.1972214256728 -44.6210201182343 454874.461086727 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
1995-Feb-06 20:41 < 00:01 Jupiter 0.623126241372099 0.623122045211922 0.623130437538136 5.15174152028763 4.88075999957245 2449755.361612114 0.705181556871947 22.8613260442336 12.4844228801325 -47.0472898598802 524164.879000073 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
2029-Sep-15 14:42 00:02 Jupiter 0.018256520271419 0.0182544704950297 0.0182585701968857 10.1965782920555 3.34349750610243 2462395.112727275 2.2695355176422 18.1626527435843 8.62935213569399 -73.8160683227014 44300.6354382606 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
2038-Feb-28 17:17 12:04 Jupiter 1.92560183637907 1.92535522645612 1.9258484307402 3.35001652057662 3.21603208031453 2465483.219919489 723.880368425106 844.691013298406 421.192628837109 -0.207650745373086 19103.9844796742 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52
2046-Oct-31 16:15 02:26 Jupiter 0.0870280785564322 0.084888789511455 0.0891855499781337 5.8072934371367 3.7761299536981 2468650.176795457 146.316030644883 9265.23992797543 90.4999924291776 -33.3049172344255 6909.15444408318 T K114/8 CATAB v2.0c-linF95 2014-Apr-14 08:52:02 2014-Apr-14 08:52

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1990.4       1989 XVII   1989n 
 1983.1   78P/1981 L1   1981 XVII   1981f 
 1975.9   78P/1973 S1   1973 XI   1973n 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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