• 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 May 23.686 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  
    CALRCK2  CALRCK2 035 35      2024 05 11.4   282.4870  18 49.9   136.0288  +46 01   29.4  20.6   J2460454.010156 Updated May 23.51 UT       71    11.76   12.2    0.514 
    A116lVm  A116lVm 035 35      2024 05 06.3   290.7267  19 22.9   046.9926  -43 00   31.5  18.5   J2460454.185603 Updated May 23.69 UT       63    15.45    9.1    1.972 
    HirJC21  HirJC21 100100      2024 05 03.8   159.5092  10 38.0   074.6053  -15 23   29.6  20.4   J2460454.184322 Updated May 23.68 UT       9    1.00   17.3   18.908 
    CAD8PW2  CAD8PW2 053 53      2024 04 04.2   110.3070  07 21.2   069.0901  -20 54   26.8  23.2   J2460454.182285 Updated May 23.68 UT       48    12.91   20.4   37.392 
    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 46.5-18 2428.9107
    A/2018 V310 38.3+16 5627.693
    A/2018 W316 18.5+32 0320.7127
    A/2019 G307 02.4+03 1328.748
    A/2019 N206 16.5+76 5024.459
    A/2019 O411 28.8+05 0526.4109
    A/2019 Q214 14.3-27 1329.7155
    A/2019 T111 28.5-07 1423.1113
    A/2020 A101 28.4+40 3629.538
    A/2020 B116 00.8-39 0932.2161
    A/2020 H910 04.6+55 3829.674
    A/2020 M410 33.6+06 5325.195
    A/2021 E205 13.5+33 5725.821
    A/2021 E400 25.2+52 0122.852
    A/2022 B304 01.0-17 4826.138
    A/2023 H402 24.3+40 0824.828
    A/2023 R309 22.7+16 5225.276
    A/2024 D109 59.3+49 1321.774
    2007 SA2405 02.3+16 2522.515
    2008 BJ2209 25.6+15 4020.977
    2009 KF3709 15.0+22 4323.972
    2010 KG4301 30.0+18 5621.035
    2010 LH1501 57.2+06 3121.633
    2011 UG10418 39.3+01 4123.9135
    2012 KA5110 42.0-37 0126.1110
    2014 XK606 51.2+33 5325.340
    2017 FL3622 20.2-10 3422.289
    2018 BJ1100 47.8+05 1021.849
    2019 AV408 10.5+23 3323.258
    2021 TR8117 51.5+07 4225.0141
    2022 AB819 02.1+04 2725.6129
    2022 DQ1702 40.8-09 5625.136
    2022 OF6008 30.7+02 4827.768
    2023 BN1314 08.6-22 1323.5154
    2023 JN1621 56.2-16 5120.297
    2023 RS6101 51.3+25 3522.030
    2024 FG907 32.7+20 2820.650
    (7341)03 23.2+21 1819.39
    (523676)13 17.3-18 1823.7142


    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.