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 ]  
357P/Hill
Classification: Jupiter-family Comet          SPK-ID: 1003002
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455170.5 (2009-Dec-05.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4354855957927546 7.3613e-07  
a 4.449559812771481 1.7112e-06 au
q 2.511840606691195 2.4069e-06 au
i 6.325982913733976 3.5966e-05 deg
node 44.67507317733931 0.00012807 deg
peri 1.288388873908715 0.001151 deg
M 36.32822124781256 0.00043855 deg
tp 2454824.548168910625
(2008-Dec-24.04816891)
0.0039785 TDB
period 3428.261965886208
9.39
0.0019777
5.415e-06
d
yr
n .1050094781502323 6.0576e-08 deg/d
Q 6.387279018851767 2.4564e-06 au
  Orbit Determination Parameters
   # obs. used (total)      293  
   data-arc span      3750 days (10.27 yr)  
   first obs. used      2008-09-28  
   last obs. used      2019-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .64964  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-15 08:31:16  

Additional Information
 Earth MOID = 1.52114 au 
 Jupiter MOID = .236612 au 
 T_jup = 2.824 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 5.0   0.8 23 2 parameter fit from 151 observations, autocmod 2.6q
comet total magnitude slope K1 30.   n/a 23 autocmod 2.6q
comet nuclear magnitude M2 15.4   0.7 23 from 108 observations, autocmod 2.6q
comet nuclear magnitude slope K2 5.   n/a 23 autocmod 2.6q
comet nuclear phase coefficient PC 0.03   n/a 23 autocmod 2.6q

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2018.4   357P/2017 Q1       
 2009.0   357P/2008 T4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Mar-05 11:42 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin