C/2022 J2 (Bok)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	26 Oct 2022	13.1	1.825 AU	1.963 AU	10h31m	+31°18'	67.3°	30.1°	302°
Nearest approach	17 Dec 2022	11.8	1.938 AU	0.985 AU	06h12m	+42°27'	159.8°	10.1°	201°
Today	25 Apr 2024	20.9	5.978 AU	6.803 AU	01h27m	-17°19'	32.4°	5.2°	200°

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.)

The orbital elements of C/2022 J2 (Bok) are:

            e (Eccentricity)                : 0.9798240
            q (Perihelion distance)         : 1.8254170
            i (Inclination)                 : 149.13740
            Ω (Longitude of ascending node) : 252.64760
            ω (Argument of perihelion)      : 133.07270
            L (Longitude of perihelion)     : 295.20521
            B (Latitude of perihelion)      : 22.00740
            T (Time of perihelion passage)  : 2459879.45860
            P (Orbital period in years)     : 860.58

            Epoch                           : 2024 Apr 24
            Reference                       : MPEC 2023-M14

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

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. 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. (9.00 + 5 log[∆] + 10.00 log[r]).

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2024-04-25 00:00 UT   01 27 20.1   -17 19 40     6.803    5.978   32.3    5.2   200   20.9 
2024-04-25 01:35 UT   01 27 21.6   -17 19 40     6.803    5.978   32.4    5.2   200   20.9 
2024-04-26 00:00 UT   01 27 43.5   -17 19 40     6.805    5.986   32.9    5.2   201   20.9 
2024-04-27 00:00 UT   01 28 06.9   -17 19 44     6.807    5.994   33.5    5.3   202   20.9 
2024-04-28 00:00 UT   01 28 30.1   -17 19 53     6.808    6.002   34.1    5.4   204   20.9 
2024-04-29 00:00 UT   01 28 53.2   -17 20 06     6.810    6.010   34.7    5.5   205   21.0 
2024-04-30 00:00 UT   01 29 16.1   -17 20 24     6.811    6.018   35.4    5.6   206   21.0 
2024-05-01 00:00 UT   01 29 38.9   -17 20 46     6.812    6.026   36.0    5.6   207   21.0 
2024-05-02 00:00 UT   01 30 01.5   -17 21 12     6.812    6.034   36.7    5.7   208   21.0 
2024-05-03 00:00 UT   01 30 23.9   -17 21 43     6.813    6.042   37.3    5.8   209   21.0 
2024-05-04 00:00 UT   01 30 46.2   -17 22 18     6.813    6.050   38.0    5.9   210   21.0 
2024-05-05 00:00 UT   01 31 08.3   -17 22 58     6.813    6.058   38.7    6.0   211   21.0 

    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.