C/2012 X1 (LINEAR)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	16 Feb 2014	8.3	1.608 AU	2.096 AU	18h52m	+00°40'	47.8°	27.1°	288°
Nearest approach	28 Jun 2014	9.2	2.352 AU	1.624 AU	22h39m	-31°02'	124.2°	20.9°	261°
Today	18 Sep 2026	25.1	28.302 AU	27.830 AU	03h47m	-24°31'	117.0°	1.8°	281°

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)                : 0.9898320
    q (Perihelion distance)         : 1.6077750
    i (Inclination)                 : 44.26930
    Ω (Longitude of ascending node) : 113.47240
    ω (Argument of perihelion)      : 131.97220
    L (Longitude of perihelion)     : 74.95088
    B (Latitude of perihelion)      : 31.26287
    T (Time of perihelion passage)  : 2456704.58630
    P (Orbital period in years)     : 1988.31

    Epoch                           : 2026 Sep 18
    Reference                       : MPC194130

    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
2026-09-17 00:00 UT   03 47 17.3   -24 29 02    27.840   28.294  115.9    1.8   280   25.1 
2026-09-18 00:00 UT   03 47 13.7   -24 30 26    27.834   28.298  116.6    1.8   281   25.1 
2026-09-18 17:50 UT   03 47 10.9   -24 31 28    27.830   28.302  117.0    1.8   281   25.1 
2026-09-19 00:00 UT   03 47 10.0   -24 31 49    27.829   28.303  117.2    1.8   281   25.1 
2026-09-20 00:00 UT   03 47 06.1   -24 33 12    27.823   28.307  117.8    1.8   282   25.1 
2026-09-21 00:00 UT   03 47 02.1   -24 34 35    27.818   28.311  118.5    1.8   283   25.1 
2026-09-22 00:00 UT   03 46 58.0   -24 35 57    27.813   28.315  119.1    1.8   284   25.1 
2026-09-23 00:00 UT   03 46 53.7   -24 37 19    27.808   28.320  119.7    1.8   285   25.1 
2026-09-24 00:00 UT   03 46 49.3   -24 38 40    27.804   28.324  120.3    1.8   286   25.1 
2026-09-25 00:00 UT   03 46 44.7   -24 40 01    27.799   28.328  120.9    1.7   287   25.1 
2026-09-26 00:00 UT   03 46 40.0   -24 41 22    27.795   28.332  121.5    1.7   288   25.1 
2026-09-27 00:00 UT   03 46 35.2   -24 42 41    27.790   28.336  122.1    1.7   289   25.1 
2026-09-28 00:00 UT   03 46 30.3   -24 44 01    27.786   28.341  122.7    1.7   290   25.1 

    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.