C/2018 A6 (Gibbs)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	15 Mar 2019	13.9	3.183 AU	2.715 AU	08h49m	-60°39'	109.1°	17.2°	46°
Perihelion	11 Jul 2019	14.0	3.011 AU	3.068 AU	07h51m	-54°43'	77.2°	19.2°	172°
Today	9 Sep 2026	22.2	15.040 AU	14.363 AU	22h06m	+41°45'	130.8°	2.9°	159°

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 8.2 + 5 log[∆] + 7.0 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/2018 A6 (Gibbs) are:

    e (Eccentricity)                : 0.7991200
    q (Perihelion distance)         : 3.0109040
    i (Inclination)                 : 77.20780
    Ω (Longitude of ascending node) : 340.50650
    ω (Argument of perihelion)      : 264.20420
    L (Longitude of perihelion)     : 45.87865
    B (Latitude of perihelion)      : -75.97605
    T (Time of perihelion passage)  : 2458675.57170
    P (Orbital period in years)     : 58.03

    Epoch                           : 2026 Sep 08
    Reference                       : MPC194155

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-08 00:00 UT   22 07 25.2   +41 47 20    14.359   15.034  130.5    2.9   161   22.2 
2026-09-09 00:00 UT   22 07 04.8   +41 46 09    14.361   15.038  130.7    2.9   160   22.2 
2026-09-09 16:51 UT   22 06 50.6   +41 45 18    14.363   15.040  130.8    2.9   159   22.2 
2026-09-10 00:00 UT   22 06 44.5   +41 44 55    14.363   15.041  130.8    2.9   158   22.2 
2026-09-11 00:00 UT   22 06 24.4   +41 43 38    14.366   15.045  130.9    2.9   157   22.2 
2026-09-12 00:00 UT   22 06 04.4   +41 42 18    14.368   15.048  131.0    2.9   156   22.2 
2026-09-13 00:00 UT   22 05 44.6   +41 40 55    14.371   15.052  131.1    2.9   154   22.2 
2026-09-14 00:00 UT   22 05 24.9   +41 39 28    14.374   15.055  131.1    2.9   153   22.2 
2026-09-15 00:00 UT   22 05 05.3   +41 37 59    14.378   15.059  131.2    2.9   151   22.2 
2026-09-16 00:00 UT   22 04 45.9   +41 36 27    14.381   15.062  131.2    2.9   150   22.2 
2026-09-17 00:00 UT   22 04 26.7   +41 34 52    14.385   15.066  131.2    2.9   149   22.2 
2026-09-18 00:00 UT   22 04 07.7   +41 33 14    14.389   15.069  131.2    2.9   147   22.2 
2026-09-19 00:00 UT   22 03 48.8   +41 31 33    14.393   15.073  131.1    2.9   146   22.2 

    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.