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The International Astronomical Union Minor Planet Center

  • Processing(Info)

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

    Please ensure you are familiar with thenotes at the bottomof this page.
    Also, additional notes on the NEOCP andinformation on how we remove objects on the NEOCP are also availablehere.

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

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

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

    Page last updated on Nov. 28.881 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, nominalH and number of days since itwas observed):

    All objectswithV = to, with Decl. between° and°, with anNEO 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  
    P12hxMW  P12hxMW035 35     2025 11 23.5  071.7413  04 47.0  111.8246  +21 49  29.3  20.7  J2461007.970149 Updated Nov. 28.47 UT     35   83.54  18.7   0.766 
    STO1338  STO1338035 35     2025 11 20.2  085.8624  05 43.4  036.8559  -53 08  30.1  19.9  J2461007.075509 Updated Nov. 27.58 UT     56   7.18  12.5   1.538 
    P22bZYt  P22bZYt035 35     2025 07 26.3  238.0837  15 52.3  064.7634  -25 14  26.5  23.5  J2461007.719265 Updated Nov. 28.22 UT     19   38.99  17.2  95.574 
    The information in the table is available in atextfile. The layout of this file matches the table layout exactly, except that theR.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 ourSubmit Action Code Form
    Select your viewing point:GeocentricObservatory 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 MPCephemeris service.Please submit reports of cometary activity here.
      Desig.      R.A.      Decl.      Magn.      Elong.    
    A/2018 W316 08.2+36 3222.058
    A/2019 N207 26.9+76 5725.1120
    A/2019 T111 22.2-17 3724.468
    A/2020 M410 14.8+03 4526.091
    A/2021 E204 48.4+34 3426.6165
    A/2021 E423 13.2+30 5524.0113
    A/2023 H403 15.2+13 1027.1164
    A/2024 U201 41.8+38 1021.4143
    A/2024 W203 10.3-22 0922.3134
    A/2025 A707 21.4-31 0221.2111
    A/2025 P119 25.8+15 3821.460
    A/2025 S223 43.9+15 3418.7116
    A/2025 S301 20.1+14 2620.2138
    2008 BJ2217 24.6-15 0120.818
    2010 LH1510 47.3+19 5723.690
    2011 UG10419 49.0+06 0823.959
    2014 SP22122 07.5+07 2121.791
    2014 XK611 05.9+15 0326.784
    2015 DD34923 40.7+03 4325.4111
    2017 QN8410 54.1-05 0321.079
    2015 XG16210 14.6+21 0123.698
    2018 BJ1106 29.1+27 4121.5149
    2019 AV413 00.7-15 2225.546
    2021 AY811 39.9+07 1723.073
    2022 AB818 39.8+10 1227.648
    2022 DQ1705 18.7+03 0824.2156
    2022 OF6009 12.2+17 3828.5110
    2023 BN1319 31.3-17 3524.946
    2024 XE2205 15.7-06 1821.2149
    (3200)01 40.3+34 0918.0144
    (7341)18 55.4-22 4722.637
    (523676)14 19.4-19 3724.127
    (756998)05 08.2+24 1224.6167

    Notes on how to begin your ownastrometric program are available.Please ensure that you have read theadditionalnotes on the NEOCP (which are relevant to the PCCP).Please do not report observations of non-NEOCP objects in the samemessage as observations of objects on this page!Please report unsuccessful attempts to detect objects listed here thatare NOT listed as `updated' or that have not been updated in the past 24 hoursusingthe NEOCP Blog.Please note that observations and orbits of objects accessible viathis service are made available only for your personal use. Theyare not to be promulgated via any medium. The data are preliminary untilthey appear on anMPEC orMPS.

    You can now access ephemerides for the variantorbits used in the uncertainty plots from the pages listing the offsetsfrom the nominal solutions.Pleaseread(orhere)about the coloration used in the uncertainty plots.

    You are reminded that a cross-reference ofdesignations that have appeared here previously is availableelsewhere.

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