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Sormano Astronomical Observatory: CCEL
Cometary Close Encounters List

Last update: April 14, 2026

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) 0.007 SG __
342P (SOHO) 0.0194 SG __
C/1989 A3 (Bradfield) 0.0018 __ no close encounters
C/2002 S7 (SOHO) 0.0130 SG __
C/2025 F2 (SWAN) 0.0060 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)___
27P (Crommelin) 0.0285 __ no close encounters
45P (Honda-Mrkos-Pajdusakova) 0.0014 __ no close encounters
249P (LINEAR) 0.0265 __ no close encounters
323P (SOHO) 0.0107 SG __
501P (Rankin) 0.0018 __ 2060-11-06 _____ 0.069
C/1917 F1 (Mellish) 0.0084 __ no close encounters
C/2024 E1 (Wierzchos) 0.0334 __ 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/2008 Y12 (SOHO) 0.0211 SG __
P/2024 OC2 (PANSTARRS) 0.0036 __ 2058-12-04 _____ 0.134
2067-04-20 ______ 0.094
2114-01-25 ______ 0.075

____Earth_____
Ephem
.
.		 ___ Object
_
_____________________________		 Planet's
MOID
____ (AU)_____		 Status
_____
.		 __PREDICTED CLOSE ENCOUNTERS_
__________Date ______Nominal
_______yyyymmdd___Distance (AU)___
3D (Biela) 0.0003 DL __
15P (Finlay) 0.0051 __ 2060-10-22 _____ 0.0330
21P (Giacobini-Zinner) 0.0131 __ 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) 0.0024 __ no close encounters
252P (LINEAR) 0.0194 __ no close encounters
255P (LEVY) 0.0243 __ no close encounters
289P (Blanpain) 0.0200 __ no close encounters
300P (Catalina) 0.0229 __ 2036-06-09 _____ 0.0504
320P (McNaught) 0.0330 __ no close encounters
323P (SOHO) 0.0221 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) 0.0096 __ no close encounters
P/2021 N1 (ZTF) 0.0178 __ no close encounters
P/2024 OC2 (PANSTARRS) 0.0203 __ 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) 0.0238 __ no close encounters
13P (Olbers) 0.0217 __ no close encounters
38P (Stephan-Oterma) 0.0347 __ no close encounters
45P (Honda-Mrkos-Pajdusakova) 0.0214 __ no close encounters
58P (Jackson-Neujmin) 0.0156 __ 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) 0.0079 __ no close encounters
144P (Kushida) 0.0142 __ no close encounters
148P (Anderson-LINEAR) 0.0299 __ no close encounters
157P (Tritton) 0.0055 __ 2088-11-24 ______ 0.057
2102-01 13 ______ 0.035
168P (Hergenrother) 0.0031 __ 2026-04-26 _____ 0.0612
201P (LONEOS) 0.0092 __ no close encounters
207P (NEAT) 0.0174 __ no close encounters
212P (NEAT) 0.0233 __ no close encounters
249P (LINEAR) 0.0296 __ no close encounters
275P (Hermann) 0.0048 __ no close encounters
294P (LINEAR) 0.0194 __ no close encounters
304P (Ory) 0.0070 __ 2070-02-24 _____ 0.0749
2092-04-17 _____ 0.0173
305P (Skiff) 0.0132 __ no close encounters
323P (SOHO) 0.0057 SG __
325P (Yang-Gao) 0.0087 __ no close encounters
335P (Gibbs) 0.0307 __ no close encounters
365P (PANSTARRS) 0.0121 __ no close encounters
384P (Kowalski) 0.0231 __ no close encounters
412P (WISE) 0.0178 __ no close encounters
444P (WISE-PANSTARRS) 0.0326 __ no close encounters
489P (Denning) 0.0221 __ no close encounters
C/2014 W9 (PANSTARRS) 0.0264 __ no close encounters
C/2018 M1 (Catalina) 0.0328 __ no close encounters
C/2026 B2 (Sun-Gao) 0.0208 __ no close encounters
C/2026 C1 (Tsuchinshan) 0.0131 __ no close encounters
D/1978 R1 (Haneda-Campos) 0.0146 DL __
P/2017 Y3 (Leonard) 0.0329 __ no close encounters
P/2019 T5 (ATLAS) 0.0270 __ no close encounters
P/2024 OC2 (PANSTARRS) 0.0126 __ 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: April 14, 2026