C/2018 Y1 (Iwamoto)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion4 Feb 20197.21.287 AU0.409 AU12h16m-04°12'129.9°36.0°295°
Nearest approach11 Feb 20196.61.291 AU0.306 AU09h59m+19°06'172.9°5.4°225°
Today19 Mar 202432.115.288 AU16.266 AU23h45m+09°44'10.5°0.7°346°
C/2018 Y1 (Iwamoto)- 2024-03-19
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 Y1 (Iwamoto) are:

            e (Eccentricity)                : 0.9898920
            q (Perihelion distance)         : 1.2866660
            i (Inclination)                 : 160.44040
            Ω (Longitude of ascending node) : 147.42000
            ω (Argument of perihelion)      : 357.86990
            L (Longitude of perihelion)     : 149.42728
            B (Latitude of perihelion)      : -0.71298
            T (Time of perihelion passage)  : 2458519.22080
            P (Orbital period in years)     : 1436.15

            Epoch                           : 2024 Mar 18
            Reference                       : MPEC 2024-A43

            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 7.46 + 5 log[∆] + 15.68 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
2024-03-19 00:00 UT   23 45 29.7   +09 44 11    16.264   15.287   10.6    0.7   347   32.1 
2024-03-19 05:27 UT   23 45 32.5   +09 44 28    16.266   15.288   10.5    0.7   346   32.1 
2024-03-20 00:00 UT   23 45 42.1   +09 45 24    16.271   15.293   10.4    0.7   342   32.1 
2024-03-21 00:00 UT   23 45 54.5   +09 46 38    16.277   15.298   10.4    0.7   337   32.1 
2024-03-22 00:00 UT   23 46 06.8   +09 47 52    16.283   15.304   10.4    0.7   332   32.1 
2024-03-23 00:00 UT   23 46 19.1   +09 49 06    16.288   15.310   10.5    0.7   327   32.1 
2024-03-24 00:00 UT   23 46 31.4   +09 50 21    16.294   15.316   10.7    0.7   322   32.1 
2024-03-25 00:00 UT   23 46 43.7   +09 51 37    16.299   15.321   11.0    0.7   317   32.1 
2024-03-26 00:00 UT   23 46 55.9   +09 52 52    16.304   15.327   11.3    0.7   312   32.1 
2024-03-27 00:00 UT   23 47 08.0   +09 54 09    16.308   15.333   11.7    0.8   308   32.1 
2024-03-28 00:00 UT   23 47 20.2   +09 55 25    16.312   15.339   12.1    0.8   304   32.1 
2024-03-29 00:00 UT   23 47 32.2   +09 56 43    16.316   15.344   12.7    0.8   301   32.1 


    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.