37P/Forbes
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	6 May 2024	17.7	2.184 AU	1.273 AU	12h32m	-19°44'	146.1°	14.9°	91°
Perihelion	11 Oct 2024	14.3	1.618 AU	1.947 AU	16h48m	-26°09'	56.1°	30.8°	99°
Today	28 Oct 2025	25.7	3.432 AU	2.479 AU	02h56m	+29°46'	160.7°	5.5°	214°

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 5.8 + 5 log[∆] + 33.4 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 37P/Forbes are:

    e (Eccentricity)                : 0.5325650
    q (Perihelion distance)         : 1.6181000
    i (Inclination)                 : 8.94780
    Ω (Longitude of ascending node) : 314.54630
    ω (Argument of perihelion)      : 330.06920
    L (Longitude of perihelion)     : 284.91792
    B (Latitude of perihelion)      : -4.45089
    T (Time of perihelion passage)  : 2460594.70980
    P (Orbital period in years)     : 6.44

    Epoch                           : 2025 Oct 28
    Reference                       : MPC184416

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.867

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-27 00:00 UT   02 58 23.6   +29 52 43     2.477    3.422  158.8    6.0   219   25.6 
2025-10-28 00:00 UT   02 57 26.3   +29 49 44     2.478    3.427  159.8    5.8   216   25.7 
2025-10-28 23:33 UT   02 56 29.8   +29 46 40     2.479    3.432  160.7    5.5   214   25.7 
2025-10-29 00:00 UT   02 56 28.7   +29 46 37     2.479    3.432  160.7    5.5   214   25.7 
2025-10-30 00:00 UT   02 55 30.9   +29 43 22     2.481    3.437  161.6    5.2   211   25.7 
2025-10-31 00:00 UT   02 54 33.0   +29 39 59     2.482    3.442  162.5    5.0   209   25.7 
2025-11-01 00:00 UT   02 53 35.0   +29 36 29     2.485    3.447  163.3    4.7   205   25.7 
2025-11-02 00:00 UT   02 52 36.9   +29 32 51     2.487    3.452  164.1    4.5   202   25.8 
2025-11-03 00:00 UT   02 51 38.8   +29 29 06     2.490    3.457  164.8    4.3   198   25.8 
2025-11-04 00:00 UT   02 50 40.9   +29 25 13     2.493    3.462  165.5    4.1   194   25.8 
2025-11-05 00:00 UT   02 49 43.0   +29 21 14     2.496    3.467  166.0    4.0   190   25.8 
2025-11-06 00:00 UT   02 48 45.3   +29 17 09     2.500    3.472  166.6    3.8   185   25.9 
2025-11-07 00:00 UT   02 47 47.8   +29 12 57     2.504    3.477  167.0    3.7   180   25.9 

    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.