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

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
420P/Hill (2021 E1)
Classification: Jupiter-family Comet          SPK-ID: 1003033
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456076.5 (2012-May-29.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4946030924007834 3.6515e-06  
a 5.522370420733003 6.4605e-06 au
q 2.790988933255844 2.3141e-05 au
i 14.44462833867949 8.0256e-05 deg
node 174.0921184361857 6.6241e-05 deg
peri 157.7927798850512 0.0014815 deg
M 80.59012607020317 0.00052378 deg
tp 2455015.376182680302
(2009-Jul-02.87618268)
0.0054416 TDB
period 4740.091533078406
12.98
0.008318
2.277e-05
d
yr
n .07594790047571118 1.3328e-07 deg/d
Q 8.253751908210161 9.6559e-06 au
  Orbit Determination Parameters
   # obs. used (total)      184  
   data-arc span      4393 days (12.03 yr)  
   first obs. used      2009-08-16  
   last obs. used      2021-08-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .82688  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-04 23:43:26  

Additional Information
 Earth MOID = 1.78751 au 
 Jupiter MOID = .719528 au 
 T_jup = 2.676 
[ 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 14.1   0.9 25 2 parameter fit from 95 observations, autocmod 2.9e
comet total magnitude slope K1 7.25   n/a 25 autocmod 2.9e

[ 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
1979-Jan-13 13:49 00:53 Saturn 1.93491390402404 1.93450352590268 1.93532441495232 4.52264937899473 4.49357420740625 2443887.075709209 53.272019854556 32651.7179875329 1638.35343835586 51.6817692710116 172729.553590047 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
1982-Jan-10 04:08 00:36 Jupiter 0.86230125873807 0.861880720193205 0.862722021956994 7.81132888228781 7.68454917694048 2444979.672220699 35.9409987303322 30557.7230241496 1886.56607439919 -47.3235286463568 40701.1295342327 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
1993-Nov-11 00:55 02:40 Jupiter 1.24171735519594 1.24142320016275 1.24201166211535 5.08629343694289 4.95036413397425 2449302.538202616 159.863262986234 26492.0573366662 1365.60334060526 56.0723904332956 91018.174153633 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2022-Dec-14 09:15 01:01 Jupiter 1.93164773623891 1.93155590035371 1.93173957680463 7.78953684005622 7.73303881934403 2459927.885405157 60.8038375588986 7090.78474380762 2112.60206939133 -53.9154565843795 48676.7628636355 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2036-Oct-24 10:12 01:52 Jupiter 1.22848411154168 1.2284199579389 1.22854834045711 6.88150858268078 6.78057434970608 2464990.924871562 111.621887399809 17453.0563849401 1491.65558425002 81.1081606634728 355466.893614006 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2067-Jan-05 11:51 02:53 Saturn 1.81758241756439 1.81724722994107 1.81791771721994 3.20333017409037 3.15947042137177 2476020.993861409 173.091868656228 29365.560170929 5721.30960002094 57.3311977292713 33283.5187262643 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2148-Jan-08 10:49 08:14 Jupiter 0.909526061539893 0.907833646361311 0.911232527384484 7.58685318118192 7.46309474780111 2505607.950846589 494.24141554391 198872.243869805 3670.20813900104 -65.3786092917898 30148.5548278381 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2159-Sep-12 04:15 23:51 Jupiter 1.5254517014873 1.52175289733652 1.52916016949301 4.81065574749161 4.69381385011091 2509872.677046924 1430.88636361588 267768.264869677 2693.13282151953 46.311484395095 56921.3363190414 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2189-Jul-12 22:51 1_16:55 Jupiter 1.70977303957716 1.70817280500903 1.71138145884628 6.30715486965521 6.22811379485697 2520769.452112994 2455.17940785474 204154.628340508 2244.62825948139 -68.070207715336 41396.9931336903 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43
2191-Jun-19 12:33 1_19:49 Jupiter 1.93359735471662 1.93058085208141 1.93661657659361 4.05505485092544 3.94554930322526 2521476.022649505 2629.20296091898 190008.032498127 2018.03407625868 -42.0010087614504 35523.6403738416 T 25 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:27 2021-Sep-04 23:43

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2022.5   420P/2021 E1       
 2009.5   420P/2009 Q1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-18 21:15 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin