C/2025 V2 (Rankin)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	20 Dec 2025	19.6	5.270 AU	4.670 AU	09h48m	+11°37'	122.9°	9.0°	291°
Perihelion	22 Mar 2027	13.2	1.953 AU	1.828 AU	18h39m	+16°07'	81.8°	30.3°	272°
Nearest approach	29 Jun 2027	13.4	2.293 AU	1.417 AU	19h54m	+11°07'	140.3°	16.4°	210°

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. The light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (9.0 + 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/2025 V2 (Rankin) are:

    e (Eccentricity)                : 1.0007640
    q (Perihelion distance)         : 1.9531780
    i (Inclination)                 : 37.27390
    Ω (Longitude of ascending node) : 138.08220
    ω (Argument of perihelion)      : 102.69200
    L (Longitude of perihelion)     : 63.88477
    B (Latitude of perihelion)      : 36.21576
    T (Time of perihelion passage)  : 2461487.44780

    Epoch                           : 2025 Dec 19
    Reference                       : MPEC 2025-X35

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-19 00:00 UT   09 48 13.1   +11 33 43     4.698    5.280  121.6    9.1   290   19.6 
2025-12-20 00:00 UT   09 48 08.2   +11 36 52     4.675    5.272  122.7    9.0   290   19.6 
2025-12-20 05:51 UT   09 48 06.8   +11 37 39     4.670    5.270  122.9    9.0   291   19.6 
2025-12-21 00:00 UT   09 48 02.4   +11 40 07     4.653    5.263  123.7    8.9   291   19.6 
2025-12-22 00:00 UT   09 47 55.9   +11 43 27     4.631    5.255  124.8    8.8   291   19.5 
2025-12-23 00:00 UT   09 47 48.6   +11 46 54     4.610    5.247  125.9    8.7   291   19.5 
2025-12-24 00:00 UT   09 47 40.6   +11 50 26     4.588    5.238  126.9    8.6   291   19.5 
2025-12-25 00:00 UT   09 47 31.7   +11 54 04     4.567    5.230  128.0    8.5   291   19.5 
2025-12-26 00:00 UT   09 47 22.1   +11 57 47     4.545    5.221  129.1    8.4   291   19.5 
2025-12-27 00:00 UT   09 47 11.7   +12 01 37     4.524    5.213  130.2    8.3   290   19.4 
2025-12-28 00:00 UT   09 47 00.5   +12 05 32     4.503    5.204  131.2    8.2   290   19.4 
2025-12-29 00:00 UT   09 46 48.5   +12 09 34     4.483    5.196  132.3    8.0   290   19.4 
2025-12-30 00:00 UT   09 46 35.8   +12 13 41     4.462    5.187  133.4    7.9   290   19.4 

    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.