• MPC Preparation (Info)

    • The Possible Comet (and A/ objects) Confirmation Page

    Please ensure you are familiar with the notes at the bottom of this page.
    Also, additional notes on the NEOCP and information on how we remove objects on the NEOCP are also available here.

    The objects listed on this page may be comets. All reports of new cometary activity should be made using the following web form (Reports of activity for known comets made to the above web form will be ignored.) New reports of cometary activity must be made using this web form in order to be considered for inclusion in any resulting MPEC announcing cometary status.

    IF YOU DO NOT DETECT CLEAR COMETARY ACTIVITY, DO NOT CLAIM THAT AN OBJECT IS A COMET.

    We will be operating a "reputation based" system for judging whether claims are valid. If you report cometary activity for an object later shown to be asteroidal, you may find that future reports of cometary activity by your observing station will be ignored by the MPC.

    Page last updated on July 17.485 UTC.
    Problems? Comments?

    Select object(s) from the current list of possible comets needing confirmation (NEO desirability score, discovery date, rough current position and magnitude given, as well as number of observations, arc, nominal H and number of days since it was observed):

    All objects with V = to , with Decl. between ° and °, with an NEO desirability score of % to %
    or just the objects selected below:
      Temp Desig      Score      Discovery   R.A.     Decl.     V   Updated  Note     NObs     Arc    H    Not Seen/dys  
    P22bF7T  P22bF7T 035 35      2025 07 16.5   303.5201  20 14.1   076.0353  -13 57   29.0  21.0   J2460873.961552 Updated July 17.46 UT       49   842.79   15.2    0.233 
    The information in the table is available in a text file. The layout of this file matches the table layout exactly, except that the R.A. is converted to decimal hours and the Decl. to decimal degrees. If you need to delete one of your discoveries as "does not exist" or "artificial", or flag it as "cometary", etc., please submit the corresponding "action code" through our Submit Action Code Form

    Select your viewing point: Geocentric Observatory code
    Longitude ° E, latitude °, altitude m.
    Longitudes and latitudes should be entered in decimal degrees.
    Ephemeris interval: 1 hour 30 mins 10 mins 1 min
    Start ephemerides at now + hours
    Display positions in: truncated sexagesimal or full sexagesimal or decimal units
    Display motions as: "/sec, "/min, "/hr or °/day.
    Total motion and direction Separate R.A. and Decl. coordinate motions Separate R.A. and Decl. sky motions
    Full output Brief output
    Suppress output at or when object's altitude is below °.

    The following objects either display comet-like orbits but have not had their cometary nature confirmed, or are suspected of displaying cometary activity. To get ephemerides of these objects, refer to the MPC ephemeris service. Please submit reports of cometary activity here.
      Desig.       R.A.       Decl.       Magn.       Elong.    
    A/2010 LN13510 51.6-17 2629.260
    A/2018 V310 33.3+16 2128.340
    A/2018 W315 49.7+40 4621.897
    A/2019 G306 58.9+04 3229.120
    A/2019 N207 03.3+73 1525.152
    A/2019 O411 12.8+00 0227.255
    A/2019 Q213 57.9-24 1630.5101
    A/2019 T110 59.8-12 3424.259
    A/2020 A101 14.7+41 2130.182
    A/2020 B116 05.2-38 0833.1130
    A/2020 H909 52.6+55 3130.342
    A/2020 M410 00.1+06 3025.936
    A/2021 E205 05.1+33 3726.737
    A/2021 E400 02.3+39 1023.895
    A/2022 B303 34.8-28 0527.278
    A/2023 H403 40.9+19 5727.257
    A/2023 R312 29.4-10 0528.876
    A/2024 G801 01.4+19 2827.693
    A/2024 U203 02.1+33 1921.963
    A/2024 W204 27.2+10 3822.548
    A/2025 A708 18.7-04 5420.027
    2008 BJ2214 46.0-01 5520.4105
    2010 LH1508 13.9+27 4623.49
    2011 UG10419 49.3+14 0223.4145
    2014 XK609 31.8+23 1526.725
    2015 DD34900 09.5+07 4325.4109
    2015 XG16207 40.9+24 4623.54
    2018 BJ1105 15.3+25 4422.234
    2019 AV411 19.3-02 5925.358
    2021 AY808 11.3+23 3322.76
    2022 AB818 43.7+13 4927.0142
    2022 DQ1704 58.5+05 1425.343
    2022 OF6008 38.9+16 2328.414
    2023 BN1318 46.2-19 5423.5166
    2024 XE2204 47.5-00 5121.949
    (3200)03 42.6+34 3718.754
    (7341)17 33.3-26 0621.0150
    (523676)13 43.5-17 4324.196
    (756998)04 42.4+23 5425.742

    Notes on how to begin your own astrometric program are available. Please ensure that you have read the additional notes on the NEOCP (which are relevant to the PCCP). Please do not report observations of non-NEOCP objects in the same message as observations of objects on this page! Please report unsuccessful attempts to detect objects listed here that are NOT listed as `updated' or that have not been updated in the past 24 hours using the NEOCP Blog. Please note that observations and orbits of objects accessible via this service are made available only for your personal use. They are not to be promulgated via any medium. The data are preliminary until they appear on an MPEC or MPS.

    You can now access ephemerides for the variant orbits used in the uncertainty plots from the pages listing the offsets from the nominal solutions. Please read (or here) about the coloration used in the uncertainty plots.

    You are reminded that a cross-reference of designations that have appeared here previously is available elsewhere.