C/2012 X1 (LINEAR)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	15 Feb 2014	8.3	1.615 AU	2.111 AU	18h50m	+00°30'	47.4°	26.7°	288°
Nearest approach	28 Jun 2014	9.2	2.361 AU	1.633 AU	22h39m	-31°12'	124.4°	20.8°	262°
Today	24 Dec 2025	24.8	27.158 AU	26.690 AU	03h31m	-25°51'	117.4°	1.8°	41°

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. (4.8 + 5 log[∆] + 9.0 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/2012 X1 (LINEAR) are:

    e (Eccentricity)                : 0.9898730
    q (Perihelion distance)         : 1.6153000
    i (Inclination)                 : 44.28820
    Ω (Longitude of ascending node) : 113.35110
    ω (Argument of perihelion)      : 132.16060
    L (Longitude of perihelion)     : 75.02298
    B (Latitude of perihelion)      : 31.17157
    T (Time of perihelion passage)  : 2456703.85680
    P (Orbital period in years)     : 2014.46

    Epoch                           : 2025 Dec 23
    Reference                       : MPC108592

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-23 00:00 UT   03 32 01.4   -25 52 43    26.669   27.151  118.4    1.8    40   24.8 
2025-12-24 00:00 UT   03 31 54.1   -25 51 59    26.683   27.155  117.8    1.8    41   24.8 
2025-12-24 12:12 UT   03 31 50.5   -25 51 37    26.690   27.158  117.4    1.8    41   24.8 
2025-12-25 00:00 UT   03 31 47.0   -25 51 14    26.697   27.160  117.1    1.8    42   24.8 
2025-12-26 00:00 UT   03 31 40.0   -25 50 27    26.711   27.164  116.4    1.9    43   24.8 
2025-12-27 00:00 UT   03 31 33.1   -25 49 39    26.725   27.168  115.8    1.9    44   24.8 
2025-12-28 00:00 UT   03 31 26.4   -25 48 49    26.740   27.173  115.1    1.9    45   24.8 
2025-12-29 00:00 UT   03 31 19.7   -25 47 58    26.755   27.177  114.4    1.9    45   24.8 
2025-12-30 00:00 UT   03 31 13.2   -25 47 05    26.770   27.181  113.8    1.9    46   24.8 
2025-12-31 00:00 UT   03 31 06.8   -25 46 10    26.785   27.186  113.1    1.9    47   24.8 
2026-01-01 00:00 UT   03 31 00.5   -25 45 15    26.800   27.190  112.4    1.9    48   24.9 
2026-01-02 00:00 UT   03 30 54.4   -25 44 18    26.815   27.194  111.7    1.9    49   24.9 
2026-01-03 00:00 UT   03 30 48.4   -25 43 19    26.830   27.199  111.0    1.9    50   24.9 

    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.