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242P/Spahr
Classification: Jupiter-family Comet          SPK-ID: 1000236
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455399.5 (2010-Jul-22.0) TDB
Reference: JPL 89 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3141568463391375 2.3865e-07  
a 5.645375723299816 4.1898e-07 au
q 3.871842289668418 1.156e-06 au
i 32.14612400222178 1.511e-05 deg
node 181.1266508618351 3.3609e-05 deg
peri 250.5862742849791 9.0121e-05 deg
M 313.7460821502432 4.1028e-05 deg
tp 2456028.982596908944
(2012-Apr-11.48259691)
0.00053691 TDB
period 4899.341405485102
13.41
0.00054542
1.493e-06
d
yr
n .07347926388574569 8.1802e-09 deg/d
Q 7.418909156931214 5.5061e-07 au
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      5994 days (16.41 yr)  
   first obs. used      1997-10-29  
   last obs. used      2014-03-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .70006  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:04  

Additional Information
 Earth MOID = 3.04544 au 
 Jupiter MOID = .253512 au 
 T_jup = 2.596 
[ 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 6.8   0.7 89 from 189 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 14.25   n/a 89 autocmod 2.9c
comet nuclear magnitude M2 12.6   0.7 89 from 300 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 89 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 89 autocmod 2.9c

[ 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
2010-Oct-12 05:28 00:01 Jupiter 0.357013846756351 0.357009164206768 0.35701852939677 8.78282145386464 8.50840246942127 2455481.727805144 1.38119605865207 441.621716333999 148.131640873911 64.3989794695285 310453.711046828 T 89 CATAB v2.0g-lin.ifort 2021-Apr-15 23:28:06 2021-Apr-15 23:28
2028-Jun-02 20:31 00:04 Jupiter 1.26262577004336 1.26254850050409 1.2627030764707 6.76703896741434 6.66716822987458 2461925.354783973 3.54369662517567 11537.5595320647 296.667034046253 -70.5155586317579 632550.441267987 T 89 CATAB v2.0g-lin.ifort 2021-Apr-15 23:28:06 2021-Apr-15 23:28
2040-May-06 18:25 00:05 Jupiter 0.613387070976646 0.613313303409027 0.613460841506463 8.17165525021652 8.00088504959553 2466281.267088410 5.12778946998273 4264.06665151698 326.744483405887 30.9554800332626 137900.593686339 T 89 CATAB v2.0g-lin.ifort 2021-Apr-15 23:28:06 2021-Apr-15 23:28
2129-Apr-25 01:15 03:22 Jupiter 0.26746053226744 0.266331019084205 0.268593731825771 8.94930679273168 8.58814758683342 2498775.551740130 202.093190558259 75755.0010556833 190.165582050564 -42.0589622402446 137061.279125154 T 89 CATAB v2.0g-lin.ifort 2021-Apr-15 23:28:06 2021-Apr-15 23:28
2141-Jan-03 20:19 09:53 Jupiter 0.756619690568723 0.75255686977534 0.760685966063077 9.37098001679434 9.250745994405 2503047.346639518 592.725306875834 218317.521650405 347.384988061529 -22.174191469939 114792.865959408 T 89 CATAB v2.0g-lin.ifort 2021-Apr-15 23:28:06 2021-Apr-15 23:28

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2012.3   242P/2010 P3       
 1998.9   242P/1998 U4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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