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    • 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 Mar. 27.663 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  
    A11kNtD  A11kNtD 100100      2025 03 22.0   065.3228  04 21.3   056.2997  -33 42   30.9  19.1   J2460761.176603 Updated Mar. 26.68 UT       27    2.99   16.7    2.630 
    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 53.2-19 0329.0152
    A/2018 V310 38.5+16 4727.9148
    A/2018 W316 33.3+37 0621.6110
    A/2019 G306 44.6+03 1329.095
    A/2019 N205 52.8+76 4924.986
    A/2019 O411 26.1-00 1626.6166
    A/2019 Q214 22.3-26 5730.2142
    A/2019 T111 16.5-14 4023.5160
    A/2020 A100 57.2+38 0130.036
    A/2020 B116 32.6-38 5733.0113
    A/2020 H909 56.3+59 2330.0112
    A/2020 M410 09.6+05 4525.4146
    A/2021 E204 39.7+33 2726.567
    A/2021 E423 44.3+36 0923.635
    A/2022 B303 06.7-26 5926.949
    A/2023 H402 40.1+20 3126.738
    A/2023 R312 49.7-12 4227.3168
    A/2024 D109 15.2+61 2921.0107
    A/2024 G800 32.7+06 0726.64
    A/2024 U202 38.2+25 4921.940
    A/2024 W203 19.0+23 3622.348
    A/2025 A709 27.6-01 1019.6136
    2007 SA2406 05.8+10 3223.585
    2008 BJ2215 28.2-04 3319.9134
    2009 KF3713 19.6+08 5621.7162
    2010 KG4302 55.9+29 1222.145
    2010 LH1505 28.2+31 2423.077
    2010 LH15509 50.8+00 1418.6142
    2011 UG10420 00.6+04 5924.365
    2012 KA5110 47.4-39 5126.3137
    2014 XK608 44.6+30 5326.1118
    2015 DD34923 39.8+04 1325.511
    2015 XG16205 08.5+22 5623.672
    2017 FL3600 28.9+14 1722.212
    2018 BJ1102 42.8+18 1422.138
    2019 AV411 17.7-03 2223.8164
    2021 AY804 51.2+25 5022.968
    2021 TR8118 33.8+07 2126.287
    2022 AB819 11.0+08 5027.078
    2022 DQ1703 18.4-02 4225.444
    2022 OF6008 20.0+13 2128.1118
    2023 BN1319 05.6-22 4324.781
    2023 RS6102 07.6+29 2221.537
    (3200)00 10.9-01 4616.85
    (7341)18 44.8-26 4421.786
    (523676)14 00.9-20 2423.8150

    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.