C/2022 W2 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	21 Jan 2023	18.2	3.160 AU	2.812 AU	22h17m	+80°13'	101.6°	17.8°	30°
Perihelion	8 Mar 2023	18.3	3.128 AU	2.962 AU	04h04m	+74°20'	90.3°	18.5°	72°
Today	17 Jul 2026	26.3	10.319 AU	10.691 AU	09h52m	-37°22'	65.9°	5.2°	147°

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 11.0 + 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/2022 W2 (ATLAS) are:

    e (Eccentricity)                : 0.9907900
    q (Perihelion distance)         : 3.1283610
    i (Inclination)                 : 63.48960
    Ω (Longitude of ascending node) : 320.41930
    ω (Argument of perihelion)      : 123.36520
    L (Longitude of perihelion)     : 286.28845
    B (Latitude of perihelion)      : 48.36268
    T (Time of perihelion passage)  : 2460011.99970
    P (Orbital period in years)     : 6260.17

    Epoch                           : 2026 Jul 16
    Reference                       : MPC194183

    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
2026-07-16 00:00 UT   09 51 59.6   -37 22 03    10.674   10.312   66.5    5.2   146   26.2 
2026-07-17 00:00 UT   09 52 22.9   -37 22 18    10.689   10.318   66.0    5.2   147   26.3 
2026-07-17 02:58 UT   09 52 25.8   -37 22 21    10.691   10.319   65.9    5.2   147   26.3 
2026-07-18 00:00 UT   09 52 46.4   -37 22 37    10.704   10.324   65.5    5.1   148   26.3 
2026-07-19 00:00 UT   09 53 10.0   -37 23 00    10.720   10.330   64.9    5.1   149   26.3 
2026-07-20 00:00 UT   09 53 33.8   -37 23 27    10.735   10.337   64.4    5.1   149   26.3 
2026-07-21 00:00 UT   09 53 57.8   -37 23 58    10.750   10.343   63.9    5.1   150   26.3 
2026-07-22 00:00 UT   09 54 21.9   -37 24 32    10.764   10.349   63.4    5.0   151   26.3 
2026-07-23 00:00 UT   09 54 46.1   -37 25 11    10.779   10.356   62.9    5.0   152   26.3 
2026-07-24 00:00 UT   09 55 10.5   -37 25 53    10.794   10.362   62.3    5.0   152   26.3 
2026-07-25 00:00 UT   09 55 35.0   -37 26 39    10.808   10.368   61.8    5.0   153   26.3 
2026-07-26 00:00 UT   09 55 59.6   -37 27 29    10.823   10.374   61.3    4.9   154   26.3 
2026-07-27 00:00 UT   09 56 24.3   -37 28 23    10.837   10.381   60.8    4.9   155   26.3 

    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.