C/2018 N2 (ASASSN)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	18 Oct 2019	11.7	3.144 AU	2.227 AU	01h08m	+36°46'	152.4°	8.4°	167°
Perihelion	12 Nov 2019	11.8	3.135 AU	2.339 AU	00h14m	+39°09'	136.9°	12.5°	108°
Today	31 May 2025	22.0	15.129 AU	14.601 AU	13h38m	+21°23'	119.6°	3.3°	133°

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 N2 (ASASSN) are:

            e (Eccentricity)                : 1.0020110
            q (Perihelion distance)         : 3.1354920
            i (Inclination)                 : 77.49740
            Ω (Longitude of ascending node) : 24.52640
            ω (Argument of perihelion)      : 25.32350
            L (Longitude of perihelion)     : 30.37538
            B (Latitude of perihelion)      : 24.68225
            T (Time of perihelion passage)  : 2458799.58230

            Epoch                           : 2025 May 29
            Reference                       : MPEC 2022-YN2

            Classification(s):              : Nearly isotropic; New (a > 10000 AU)
        

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 (6.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.40 + 5 log[∆] + 9.11 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
2025-05-31 00:00 UT   13 38 59.9   +21 23 31    14.600   15.128  119.7    3.3   133   22.0 
2025-05-31 02:09 UT   13 38 58.8   +21 23 24    14.601   15.129  119.6    3.3   133   22.0 
2025-06-01 00:00 UT   13 38 47.9   +21 22 17    14.617   15.134  118.9    3.4   133   22.0 
2025-06-02 00:00 UT   13 38 36.2   +21 21 00    14.635   15.140  118.1    3.4   132   22.0 
2025-06-03 00:00 UT   13 38 24.8   +21 19 41    14.653   15.145  117.3    3.4   131   22.0 
2025-06-04 00:00 UT   13 38 13.5   +21 18 21    14.671   15.151  116.4    3.4   131   22.0 
2025-06-05 00:00 UT   13 38 02.5   +21 16 57    14.689   15.156  115.6    3.5   130   22.0 
2025-06-06 00:00 UT   13 37 51.7   +21 15 32    14.708   15.162  114.8    3.5   129   22.0 
2025-06-07 00:00 UT   13 37 41.1   +21 14 05    14.726   15.167  114.0    3.5   129   22.0 
2025-06-08 00:00 UT   13 37 30.8   +21 12 35    14.745   15.173  113.2    3.5   128   22.0 
2025-06-09 00:00 UT   13 37 20.7   +21 11 03    14.764   15.179  112.3    3.5   128   22.0 
2025-06-10 00:00 UT   13 37 10.8   +21 09 30    14.782   15.184  111.5    3.6   127   22.0 

    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.