C/2024 N4 (Sarneczky)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	10 Jan 2025	18.4	5.399 AU	4.728 AU	08h27m	+72°25'	128.8°	8.2°	198°
Nearest approach	11 Jan 2025	18.4	5.399 AU	4.728 AU	08h26m	+72°24'	128.8°	8.2°	197°
Today	4 Mar 2026	19.3	6.206 AU	5.311 AU	10h06m	+31°36'	152.2°	4.3°	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.)

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 7.7 + 5 log[∆] + 10.0 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/2024 N4 (Sarneczky) are:

    e (Eccentricity)                : 1.0038160
    q (Perihelion distance)         : 5.3988400
    i (Inclination)                 : 49.78590
    Ω (Longitude of ascending node) : 339.64810
    ω (Argument of perihelion)      : 116.74760
    L (Longitude of perihelion)     : 287.62359
    B (Latitude of perihelion)      : 42.99436
    T (Time of perihelion passage)  : 2460685.93720

    Epoch                           : 2026 Mar 03
    Reference                       : MPC191588

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-03-03 00:00 UT   10 07 26.8   +31 39 47     5.301    6.202  153.1    4.1   154   19.3 
2026-03-04 00:00 UT   10 06 48.9   +31 36 58     5.310    6.205  152.4    4.2   152   19.3 
2026-03-04 05:06 UT   10 06 40.9   +31 36 21     5.311    6.206  152.2    4.3   152   19.3 
2026-03-05 00:00 UT   10 06 11.4   +31 34 04     5.318    6.209  151.6    4.4   150   19.3 
2026-03-06 00:00 UT   10 05 34.2   +31 31 05     5.327    6.212  150.8    4.5   148   19.3 
2026-03-07 00:00 UT   10 04 57.4   +31 28 01     5.336    6.216  150.0    4.6   147   19.3 
2026-03-08 00:00 UT   10 04 21.1   +31 24 52     5.346    6.219  149.2    4.7   145   19.3 
2026-03-09 00:00 UT   10 03 45.1   +31 21 38     5.355    6.223  148.4    4.8   144   19.3 
2026-03-10 00:00 UT   10 03 09.7   +31 18 20     5.365    6.226  147.6    4.9   142   19.3 
2026-03-11 00:00 UT   10 02 34.6   +31 14 57     5.376    6.230  146.7    5.0   141   19.3 
2026-03-12 00:00 UT   10 02 00.1   +31 11 30     5.386    6.234  145.9    5.1   140   19.3 
2026-03-13 00:00 UT   10 01 26.1   +31 07 57     5.397    6.237  145.0    5.2   139   19.3 
2026-03-14 00:00 UT   10 00 52.6   +31 04 20     5.408    6.241  144.1    5.4   137   19.3 

    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.