Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
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 ]  
99P/Kowal 1
Classification: Jupiter-family Comet          SPK-ID: 1000055
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2454592.5 (2008-May-06.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2293033165372997 1.371e-07  
a 6.126095884437833 2.0538e-07 au
q 4.721361780710736 9.1842e-07 au
i 4.338055542199966 1.2689e-05 deg
node 28.36212508211126 0.00012392 deg
peri 173.3595987767374 0.00015614 deg
M 30.64918813117246 5.9249e-05 deg
tp 2454120.990349394306
(2007-Jan-20.49034939)
0.00091569 TDB
period 5538.269839043741
15.16
0.00027851
7.625e-07
d
yr
n .06500224988354107 3.2688e-09 deg/d
Q 7.530829988164931 2.5247e-07 au
  Orbit Determination Parameters
   # obs. used (total)      677  
   data-arc span      15975 days (43.74 yr)  
   first obs. used      1977-04-24  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .75431  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-Feb-02 23:57:53  

Additional Information
 Earth MOID = 3.71872 au 
 Jupiter MOID = .313447 au 
 T_jup = 2.956 
[ show covariance matrix ]

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 6.9   0.8 24 from 430 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 12.25   n/a 24 autocmod 2.8
comet nuclear magnitude M2 11.5   0.8 24 from 149 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 24 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 24 autocmod 2.8
diameter diameter 10.2 km n/a Scotti,J (1994) BAAS 26:1375  

99P/Kowal 1          Discovered 1977-Apr-24 by Kowal, Charles T. at Palomar Mountain Observatory, California
discovered on plate/photo taken on discovery date as well as 4/25
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1991.9   99P/1991 D2   1992 VI   1991i 
 1976.7   99P/1977 H2   1977 III   1977f 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Feb-25 17:13 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin