48P/Johnson
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	2 Mar 2025	16.0	2.007 AU	2.968 AU	22h21m	-15°32'	11.6°	5.7°	224°
Today	20 Oct 2025	16.5	2.639 AU	1.757 AU	03h54m	+03°16'	145.5°	12.3°	283°
Nearest approach	28 Oct 2025	16.6	2.677 AU	1.748 AU	03h48m	+02°53'	154.1°	9.3°	295°

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 9.3 + 5 log[∆] + 14.2 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 48P/Johnson are:

    e (Eccentricity)                : 0.4265180
    q (Perihelion distance)         : 2.0067110
    i (Inclination)                 : 12.20180
    Ω (Longitude of ascending node) : 110.06390
    ω (Argument of perihelion)      : 216.78290
    L (Longitude of perihelion)     : 146.22102
    B (Latitude of perihelion)      : -7.27065
    T (Time of perihelion passage)  : 2460737.15570
    P (Orbital period in years)     : 6.55

    Epoch                           : 2025 Oct 18
    Reference                       : MPC188416

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.937

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-19 00:00 UT   03 55 26.0   +03 19 51     1.760    2.635  144.4   12.7   282   16.5 
2025-10-20 00:00 UT   03 54 48.5   +03 16 50     1.758    2.639  145.4   12.4   283   16.5 
2025-10-20 01:51 UT   03 54 45.6   +03 16 36     1.757    2.639  145.5   12.3   283   16.5 
2025-10-21 00:00 UT   03 54 09.7   +03 13 53     1.756    2.643  146.4   12.0   284   16.5 
2025-10-22 00:00 UT   03 53 29.6   +03 10 60     1.754    2.647  147.4   11.7   285   16.6 
2025-10-23 00:00 UT   03 52 48.3   +03 08 11     1.752    2.652  148.4   11.3   287   16.6 
2025-10-24 00:00 UT   03 52 05.8   +03 05 27     1.751    2.656  149.4   11.0   288   16.6 
2025-10-25 00:00 UT   03 51 22.2   +03 02 48     1.750    2.660  150.4   10.6   289   16.6 
2025-10-26 00:00 UT   03 50 37.5   +03 00 14     1.749    2.665  151.3   10.3   290   16.6 
2025-10-27 00:00 UT   03 49 51.7   +02 57 46     1.748    2.669  152.3   10.0   292   16.6 
2025-10-28 00:00 UT   03 49 05.0   +02 55 23     1.748    2.673  153.2    9.6   294   16.6 
2025-10-29 00:00 UT   03 48 17.3   +02 53 06     1.748    2.677  154.2    9.3   295   16.6 
2025-10-30 00:00 UT   03 47 28.8   +02 50 56     1.748    2.682  155.1    9.0   297   16.6 

    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.