96P/Machholz
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	16 Dec 2025	24.5	5.916 AU	6.835 AU	18h47m	-34°34'	19.5°	3.2°	120°
Perihelion	11 May 2028	2.4	0.116 AU	1.086 AU	03h33m	+20°30'	4.8°	46.8°	61°
Nearest approach	16 Jun 2028	9.8	1.034 AU	0.320 AU	16h05m	+70°58'	84.2°	77.8°	158°

This comet is a sunskirter. Although it may become very bright at perihelion, this will only be for a very short period very close to the sun.

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 12.1 + 5 log[∆] + 10.6 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 96P/Machholz are:

    e (Eccentricity)                : 0.9617270
    q (Perihelion distance)         : 0.1160070
    i (Inclination)                 : 57.58380
    Ω (Longitude of ascending node) : 93.96180
    ω (Argument of perihelion)      : 14.73970
    L (Longitude of perihelion)     : 101.98935
    B (Latitude of perihelion)      : 12.40275
    T (Time of perihelion passage)  : 2461903.46100
    P (Orbital period in years)     : 5.28

    Epoch                           : 2025 Dec 15
    Reference                       : MPEC 2025-W75

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-15 00:00 UT   18 46 39.1   -34 34 48     6.830    5.917   20.4    3.3   119   24.5 
2025-12-16 00:00 UT   18 47 21.8   -34 34 10     6.834    5.916   19.7    3.2   120   24.5 
2025-12-16 05:56 UT   18 47 32.4   -34 34 00     6.835    5.916   19.5    3.2   120   24.5 
2025-12-17 00:00 UT   18 48 04.6   -34 33 32     6.838    5.916   19.0    3.1   122   24.5 
2025-12-18 00:00 UT   18 48 47.6   -34 32 55     6.841    5.915   18.3    3.0   123   24.5 
2025-12-19 00:00 UT   18 49 30.8   -34 32 18     6.845    5.914   17.6    2.9   125   24.5 
2025-12-20 00:00 UT   18 50 14.1   -34 31 42     6.848    5.914   17.0    2.8   127   24.5 
2025-12-21 00:00 UT   18 50 57.5   -34 31 07     6.850    5.913   16.4    2.7   129   24.5 
2025-12-22 00:00 UT   18 51 41.0   -34 30 32     6.853    5.912   15.8    2.6   131   24.5 
2025-12-23 00:00 UT   18 52 24.6   -34 29 58     6.855    5.911   15.2    2.5   134   24.5 
2025-12-24 00:00 UT   18 53 08.3   -34 29 25     6.857    5.911   14.7    2.4   136   24.5 
2025-12-25 00:00 UT   18 53 52.2   -34 28 53     6.859    5.910   14.2    2.3   139   24.5 
2025-12-26 00:00 UT   18 54 36.1   -34 28 21     6.860    5.909   13.7    2.3   142   24.5 

    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.