C/2018 F1 (Grauer)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach15 Apr 201818.83.783 AU2.860 AU12h39m+13°27'153.2°6.9°149°
Perihelion10 Dec 201817.82.996 AU3.751 AU16h41m+11°13'34.8°10.8°349°
Today28 Mar 202431.914.528 AU15.501 AU00h56m-07°16'12.4°0.8°147°
C/2018 F1 (Grauer)- 2024-03-28
astro.vanbuitenen.nl


 
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The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of C/2018 F1 (Grauer) are:

            e (Eccentricity)                : 0.9867340
            q (Perihelion distance)         : 2.9962930
            i (Inclination)                 : 46.11170
            Ω (Longitude of ascending node) : 177.28910
            ω (Argument of perihelion)      : 71.52570
            L (Longitude of perihelion)     : 241.55853
            B (Latitude of perihelion)      : 43.12187
            T (Time of perihelion passage)  : 2458463.24250
            P (Orbital period in years)     : 3394.43

            Epoch                           : 2024 Mar 27
            Reference                       : MPEC 2021-R75

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
        

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (11.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 7.25 + 5 log[∆] + 16.11 log[r]).


The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.





The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.


The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.


A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.



Ephemerides:
Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2024-03-28 00:00 UT   00 55 57.9   -07 16 45    15.498   14.526   12.5    0.9   145   31.9 
2024-03-28 10:02 UT   00 56 04.8   -07 16 13    15.501   14.528   12.4    0.8   147   31.9 
2024-03-29 00:00 UT   00 56 14.4   -07 15 27    15.505   14.532   12.3    0.8   149   31.9 
2024-03-30 00:00 UT   00 56 31.0   -07 14 10    15.511   14.537   12.3    0.8   153   31.9 
2024-03-31 00:00 UT   00 56 47.5   -07 12 54    15.517   14.543   12.2    0.8   158   31.9 
2024-04-01 00:00 UT   00 57 04.0   -07 11 39    15.523   14.548   12.3    0.8   162   31.9 
2024-04-02 00:00 UT   00 57 20.6   -07 10 24    15.528   14.554   12.4    0.8   166   31.9 
2024-04-03 00:00 UT   00 57 37.1   -07 09 10    15.533   14.559   12.6    0.9   170   31.9 
2024-04-04 00:00 UT   00 57 53.7   -07 07 57    15.538   14.565   12.9    0.9   174   31.9 
2024-04-05 00:00 UT   00 58 10.2   -07 06 45    15.542   14.571   13.2    0.9   178   31.9 
2024-04-06 00:00 UT   00 58 26.8   -07 05 34    15.547   14.576   13.5    0.9   182   32.0 
2024-04-07 00:00 UT   00 58 43.3   -07 04 23    15.551   14.582   13.9    0.9   185   32.0 


    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.