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Sormano Astronomical Observatory: CCEL
Cometary Close Encounters List

Last update: November 18, 2023

Computations: Francesco Manca , Piero Sicoli , Augusto Testa (obs.sormano@alice.it).

This table includes Comets with MOID (Minimum Orbital Intersection Distance) lower than 0.0350 AU with respect to planets Mercury, Venus, Earth and Mars.

Using a software developed at Sormano Observatory by A. Testa, their motions have been integrated for one hundred years to point out approaches within 0.0750 A.U. from each planet. Encounters for Disappeared or Lost Comets (DL) , and Sungrazing (SG) comets have not been taking into account.

MOID and possible approaches to planets for Long Period comets or in Parabolic and Hyperbolic orbits are also considered at the time of their apparition.

The list is a complement of our PCEL page that includes close approaches of asteroids to planets Mercury, Venus and Mars for the next two hundred years.

All the distances are computed between the centers of mass of the bodies (Comets and Planets).

 


Mercury
Venus
Earth
Mars

This section, in addition to the form at the end of this page, links directly to the Minor Planet Center's Ephemeris Service to provide up to date positions of all the objects listed below. Astrometric observations of any of the following objects should be sent directly to obs@cfa.harvard.edu

By default, ephemerides are for 10 hours at 1 hour intervals and suppress outputs if the object is below local horizon. This service utilises the Minor Planet Ephemeris Service, courtesy of Minor Planet Center.

Display ephemerides or summary

___Mercury___.
Ephem
.
.		 ___ Object
_
_____________________________		 Planet's
MOID
____ (AU)_____		 Status
_____
.		 __PREDICTED CLOSE ENCOUNTERS_
__________Date ______Nominal
_______yyyymmdd___Distance (AU)___
2P (Encke) 0.0281 __ 2079-11-14 _____ 0.0512
2126-02-11 _____ 0.0495
323P (SOHO) 0.0001 SG __
342P (SOHO) 0.0194 SG __
C/1989 A3 (Bradfield) 0.0018 __ no close encounters
C/2002 S7 (SOHO) 0.0130 SG __
D/1766 G1 (Helfenzrieder) 0.0131 DL __
P/1999 J6 (SOHO) 0.0450 __ 2026-06-29 _____ 0.0482
2031-10-13 ______ 0.0498

____Venus_____
Ephem
.
.		 ___ Object
_
_____________________________		 Planet's
MOID
____ (AU)_____		 Status
_____
.		 __PREDICTED CLOSE ENCOUNTERS_
__________Date ______Nominal
_______yyyymmdd___Distance (AU)___
45P (Honda-Mrkos-Pajdusakova) 0.0014 __ no close encounters
249P (LINEAR) 0.0274 __ no close encounters
323P (SOHO) 0.0208 SG __
C/1917 F1 (Mellish) 0.0084 __ no close encounters
D/1770 L1 (Lexell) 0.0109 DL __
P/1999 J6 (SOHO) 0.0148 __ no close encounters
P/2005 T4 (SWAN) 0.0339 __ no close encounters
P/2007 T2 (Kowalski) 0.0118 __ no close encounters
P/2008 Y12 (SOHO) 0.0211 SG __

____Earth_____
Ephem
.
.		 ___ Object
_
_____________________________		 Planet's
MOID
____ (AU)_____		 Status
_____
.		 __PREDICTED CLOSE ENCOUNTERS_
__________Date ______Nominal
_______yyyymmdd___Distance (AU)___
3D (Biela) 0.0003 DL __
15P (Finlay) 0.0013 __ 2060-10-22 _____ 0.0330
21P (Giacobini-Zinner) 0.0180 __ no close encounters
55P (Tempel-Tuttle) 0.0074 __ no close encounters
73P/Schwassmann-Wachmann 3 0.0136 __ no close encounters
73P/Schwassmann-Wachmann 3-BT 0.0138 __ no close encounters
109P (Swift-Tuttle) 0.0004 __ no close encounters
209P (LINEAR) 0.0008 __ no close encounters
252P (LINEAR) 0.0166 __ no close encounters
255P (LEVY) 0.0243 __ no close encounters
289P (Blanpain) 0.0164 __ no close encounters
300P (Catalina) 0.0218 __ 2036-06-09 _____ 0.0504
320P (McNaught) 0.0315 __ no close encounters
323P (SOHO) 0.0298 SG __
460P (PANSTARRS) 0.0221 __ 2048-03 15 _____ 0.0502
D/1770 L1 (Lexell) 0.0142 DL __
P/1999 J6 (SOHO) 0.0141 __ no close encounters
P/2009 WX51 (Catalina) 0.0072 __ no close encounters
P/2021 N1 (ZTF) 0.0207 __ no close encounters

_____Mars_____
Ephem
.
.		 ___ Object
_
_____________________________		 Planet's
MOID
____ (AU)_____		 Status
_____
.		 __PREDICTED CLOSE ENCOUNTERS_
__________Date ______Nominal
_______yyyymmdd___Distance (AU)___
6P (d'Arrest) 0.0245 __ no close encounters
10P (Tempel) 0.0189 __ no close encounters
13P (Olbers) 0.0269 __ no close encounters
45P (Honda-Mrkos-Pajdusakova) 0.0214 __ no close encounters
58P (Jackson-Neujmin) 0.0084 __ no close encounters
62P (Tsuchinshan) 0.0244 __ no close encounters
67P (Churyumov-Gerasimenko) 0.0137 __ no close encounters
79P (du Toit-Hartley) 0.0131 __ no close encounters
81P (Wild) 0.0283 __ no close encounters
88P (Howell) 0.0080 __ 2031-09-13 _____ 0.0745
107P (Wilson-Harrington) 0.0304 __ no close encounters
114P (Wiseman-Skiff) 0.0145 __ no close encounters
144P (Kushida) 0.0266 __ 2119-05-14 _____ 0.0209
148P (Anderson-LINEAR) 0.0299 __ no close encounters
157P (Tritton) 0.0034 __ 2088-11-24 ______ 0.057
2102-01 13 ______ 0.035
168P (Hergenrother) 0.0011 __ 2026-04-26 _____ 0.0612
177P (Barnard) 0.0215 __ no close encounters
201P (LONEOS) 0.0048 __ no close encounters
207P (NEAT) 0.0174 __ no close encounters
212P (NEAT) 0.0049 __ no close encounters
249P (LINEAR) 0.0296 __ no close encounters
275P (Hermann) 0.0201 __ no close encounters
294P (LINEAR) 0.0296 __ no close encounters
304P (Ory) 0.0070 __ 2070-02-24 _____ 0.0749
2092-04-17 _____ 0.0173
305P (Skiff) 0.0071 __ no close encounters
323P (SOHO) 0.0190 SG __
335P (Gibbs) 0.0250 __ no close encounters
365P (PANSTARRS) 0.0203 __ no close encounters
384P (Kowalski) 0.0231 __ no close encounters
412P (WISE) 0.0209 __ no close encounters
444P (WISE-PANSTARRS) 0.0326 __ no close encounters
C/2014 W9 (PANSTARRS) 0.0264 __ no close encounters
D/1884 O1 (Barnard_1) 0.0084 DL __
D/1895 Q1 (Swift) 0.0057 DL __
P/2019 T5 (ATLAS) 0.0270 __ no close encounters

Start date for ephemerides: Number of dates to output

Ephemeris interval: Ephemeris units: days hours minutes seconds

For daily ephemerides, enter desired offset from 0h UT: hours

Observatory code:

Display positions in: truncated sexagesimal or full sexagesimal or decimal units

Display motions as: "/sec "/min "/hr °/day

Suppress output if sun above local horizon

Suppress output if object below local horizon

Total motion and direction Separate R.A. and Decl. sky motions Separate R.A. and Decl. coordinate motions

Generate perturbed ephemerides for unperturbed orbits

Format for elements output:

none MPC 1-line MPC 8-line

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Web Curators: M. Carpino, F. Manca
Last modified: November 18, 2023