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°08'	136.9°	12.5°	108°
Today	9 May 2025	21.9	15.007 AU	14.261 AU	13h44m	+21°40'	136.3°	2.7°	152°

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)                : 1.0020010
            q (Perihelion distance)         : 3.1353540
            i (Inclination)                 : 77.50000
            Ω (Longitude of ascending node) : 24.52490
            ω (Argument of perihelion)      : 25.32200
            L (Longitude of perihelion)     : 30.37230
            B (Latitude of perihelion)      : 24.68106
            T (Time of perihelion passage)  : 2458799.57890

            Epoch                           : 2025 May 08
            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
2025-05-09 00:00 UT   13 44 10.9   +21 40 28    14.256   15.005  136.5    2.7   152   21.9 
2025-05-09 08:50 UT   13 44 05.1   +21 40 21    14.261   15.007  136.3    2.7   152   21.9 
2025-05-10 00:00 UT   13 43 55.1   +21 40 08    14.270   15.011  135.8    2.7   151   21.9 
2025-05-11 00:00 UT   13 43 39.4   +21 39 46    14.284   15.016  135.1    2.7   150   21.9 
2025-05-12 00:00 UT   13 43 23.8   +21 39 21    14.298   15.022  134.4    2.8   149   21.9 
2025-05-13 00:00 UT   13 43 08.4   +21 38 54    14.312   15.028  133.7    2.8   148   21.9 
2025-05-14 00:00 UT   13 42 53.1   +21 38 24    14.326   15.033  133.0    2.8   147   21.9 
2025-05-15 00:00 UT   13 42 37.9   +21 37 51    14.341   15.039  132.2    2.9   146   21.9 
2025-05-16 00:00 UT   13 42 23.0   +21 37 16    14.355   15.044  131.5    2.9   145   21.9 
2025-05-17 00:00 UT   13 42 08.2   +21 36 38    14.370   15.050  130.7    2.9   144   21.9 
2025-05-18 00:00 UT   13 41 53.5   +21 35 58    14.385   15.056  130.0    3.0   143   21.9 
2025-05-19 00:00 UT   13 41 39.0   +21 35 16    14.401   15.061  129.2    3.0   142   21.9 

    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.