285P/LINEAR
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	13 Aug 2022	16.9	2.278 AU	1.526 AU	18h25m	+13°17'	126.4°	21.0°	120°
Perihelion	11 Jan 2023	16.5	1.721 AU	2.217 AU	22h41m	-07°43'	47.9°	25.1°	68°
Today	9 May 2025	23.8	5.837 AU	5.659 AU	09h26m	+00°12'	95.2°	9.9°	107°

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 285P/LINEAR are:

            e (Eccentricity)                : 0.6180950
            q (Perihelion distance)         : 1.7206400
            i (Inclination)                 : 25.03290
            Ω (Longitude of ascending node) : 185.51360
            ω (Argument of perihelion)      : 178.38640
            L (Longitude of perihelion)     : 184.05150
            B (Latitude of perihelion)      : 0.68270
            T (Time of perihelion passage)  : 2459956.35170
            P (Orbital period in years)     : 9.56

            Epoch                           : 2025 May 08
            Reference                       : MPEC 2024-L77

            Classification(s):              : Ecliptic; Jupiter family
            Tisserand (Jupiter)             : 2.480
        

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 gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (15.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 12.41 + 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
2025-05-09 00:00 UT   09 26 53.8   +00 11 20     5.650    5.835   95.6    9.9   107   23.8 
2025-05-09 10:58 UT   09 26 59.3   +00 12 33     5.659    5.837   95.2    9.9   107   23.8 
2025-05-10 00:00 UT   09 27 06.0   +00 13 58     5.669    5.839   94.7    9.9   108   23.8 
2025-05-11 00:00 UT   09 27 18.8   +00 16 31     5.688    5.842   93.8    9.9   108   23.8 
2025-05-12 00:00 UT   09 27 32.2   +00 18 60     5.707    5.846   92.9    9.9   108   23.9 
2025-05-13 00:00 UT   09 27 46.1   +00 21 24     5.726    5.849   92.0    9.9   108   23.9 
2025-05-14 00:00 UT   09 28 00.6   +00 23 45     5.745    5.852   91.1    9.9   109   23.9 
2025-05-15 00:00 UT   09 28 15.7   +00 26 01     5.764    5.856   90.2    9.9   109   23.9 
2025-05-16 00:00 UT   09 28 31.3   +00 28 13     5.783    5.859   89.3    9.9   109   23.9 
2025-05-17 00:00 UT   09 28 47.4   +00 30 21     5.802    5.862   88.4    9.9   109   23.9 
2025-05-18 00:00 UT   09 29 04.1   +00 32 25     5.821    5.866   87.6    9.9   109   23.9 
2025-05-19 00:00 UT   09 29 21.3   +00 34 24     5.840    5.869   86.7    9.9   110   23.9 

    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.