C/2013 R1 (Lovejoy)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	16 Nov 2013	5.5	1.013 AU	0.465 AU	11h32m	+38°04'	79.5°	73.7°	304°
Perihelion	18 Dec 2013	5.7	0.821 AU	0.927 AU	16h47m	+25°18'	50.8°	68.2°	342°
Today	6 Feb 2026	35.6	28.681 AU	29.248 AU	18h58m	-64°00'	54.1°	1.6°	223°

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 7.1 + 5 log[∆] + 14.5 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/2013 R1 (Lovejoy) are:

    e (Eccentricity)                : 0.9980730
    q (Perihelion distance)         : 0.8211360
    i (Inclination)                 : 63.96980
    Ω (Longitude of ascending node) : 70.69710
    ω (Argument of perihelion)      : 67.28580
    L (Longitude of perihelion)     : 117.04962
    B (Latitude of perihelion)      : 55.98309
    T (Time of perihelion passage)  : 2456645.39410
    P (Orbital period in years)     : 8796.30

    Epoch                           : 2021 Feb 13
    Reference                       : MPEC 2021-BE3

    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
2026-02-05 00:00 UT   18 58 12.9   -63 59 47    29.254   28.674   53.2    1.6   222   35.6 
2026-02-06 00:00 UT   18 58 29.1   -64 00 27    29.250   28.679   53.7    1.6   223   35.6 
2026-02-06 13:26 UT   18 58 38.1   -64 00 50    29.248   28.681   54.1    1.6   223   35.6 
2026-02-07 00:00 UT   18 58 45.1   -64 01 08    29.246   28.683   54.3    1.6   224   35.6 
2026-02-08 00:00 UT   18 59 01.0   -64 01 50    29.242   28.687   54.9    1.6   225   35.6 
2026-02-09 00:00 UT   18 59 16.7   -64 02 34    29.238   28.692   55.5    1.6   226   35.6 
2026-02-10 00:00 UT   18 59 32.3   -64 03 19    29.234   28.696   56.1    1.6   226   35.6 
2026-02-11 00:00 UT   18 59 47.6   -64 04 04    29.229   28.701   56.7    1.6   227   35.6 
2026-02-12 00:00 UT   19 00 02.8   -64 04 51    29.225   28.705   57.3    1.7   228   35.6 
2026-02-13 00:00 UT   19 00 17.8   -64 05 40    29.220   28.709   58.0    1.7   229   35.6 
2026-02-14 00:00 UT   19 00 32.7   -64 06 29    29.215   28.714   58.6    1.7   230   35.6 
2026-02-15 00:00 UT   19 00 47.3   -64 07 19    29.210   28.718   59.2    1.7   231   35.6 
2026-02-16 00:00 UT   19 01 01.7   -64 08 10    29.205   28.722   59.9    1.7   232   35.6 

    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.