C/2018 N2 (ASASSN)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	19 Oct 2019	11.7	3.146 AU	2.229 AU	01h08m	+36°49'	152.3°	8.5°	167°
Perihelion	12 Nov 2019	11.8	3.137 AU	2.340 AU	00h14m	+39°11'	137.0°	12.4°	108°
Today	2 Jan 2026	22.5	16.319 AU	16.452 AU	14h00m	+15°25'	80.5°	3.4°	297°

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.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.4 + 5 log[∆] + 9.1 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

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.

Orbital elements

The orbital elements of C/2018 N2 (ASASSN) are:

    e (Eccentricity)                : 1.0020920
    q (Perihelion distance)         : 3.1371130
    i (Inclination)                 : 77.46070
    Ω (Longitude of ascending node) : 24.54620
    ω (Argument of perihelion)      : 25.33860
    L (Longitude of perihelion)     : 30.41593
    B (Latitude of perihelion)      : 24.69316
    T (Time of perihelion passage)  : 2458799.57080

    Epoch                           : 2026 Jan 01
    Reference                       : MPEC 2022-YN2

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-01-01 00:00 UT   14 00 24.1   +15 24 39    16.465   16.312   79.4    3.4   298   22.5 
2026-01-02 00:00 UT   14 00 28.6   +15 25 18    16.455   16.318   80.3    3.4   297   22.5 
2026-01-02 07:24 UT   14 00 30.0   +15 25 31    16.452   16.319   80.5    3.4   297   22.5 
2026-01-03 00:00 UT   14 00 33.0   +15 25 60    16.445   16.323   81.2    3.4   297   22.5 
2026-01-04 00:00 UT   14 00 37.1   +15 26 42    16.435   16.329   82.1    3.4   296   22.5 
2026-01-05 00:00 UT   14 00 41.0   +15 27 27    16.425   16.334   83.0    3.4   296   22.5 
2026-01-06 00:00 UT   14 00 44.6   +15 28 14    16.415   16.339   83.9    3.4   295   22.5 
2026-01-07 00:00 UT   14 00 48.1   +15 29 02    16.404   16.345   84.8    3.4   295   22.5 
2026-01-08 00:00 UT   14 00 51.2   +15 29 51    16.394   16.350   85.7    3.4   295   22.5 
2026-01-09 00:00 UT   14 00 54.2   +15 30 43    16.384   16.356   86.6    3.4   294   22.5 
2026-01-10 00:00 UT   14 00 56.9   +15 31 36    16.374   16.361   87.5    3.4   294   22.5 
2026-01-11 00:00 UT   14 00 59.4   +15 32 31    16.363   16.367   88.4    3.4   293   22.5 
2026-01-12 00:00 UT   14 01 01.6   +15 33 27    16.353   16.372   89.3    3.4   293   22.5 

    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.