169P/NEAT
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	10 Dec 2025	21.7	3.241 AU	4.188 AU	16h24m	-13°28'	14.1°	4.2°	314°
Nearest approach	11 Aug 2026	11.9	0.953 AU	0.167 AU	14h00m	+41°31'	64.2°	106.7°	88°
Perihelion	21 Sep 2026	13.7	0.604 AU	0.627 AU	09h36m	+07°13'	34.6°	109.2°	279°

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. 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. (16.0 + 5 log[∆] + 5.0 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 169P/NEAT are:

    e (Eccentricity)                : 0.7679540
    q (Perihelion distance)         : 0.6041680
    i (Inclination)                 : 11.28520
    Ω (Longitude of ascending node) : 176.04350
    ω (Argument of perihelion)      : 218.13290
    L (Longitude of perihelion)     : 213.63436
    B (Latitude of perihelion)      : -6.94046
    T (Time of perihelion passage)  : 2461304.87430
    P (Orbital period in years)     : 4.20

    Epoch                           : 2025 Dec 09
    Reference                       : MPEC 2025-W75

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.887

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-09 00:00 UT   16 22 37.2   -13 25 10     4.200    3.249   13.3    4.0   316   21.7 
2025-12-10 00:00 UT   16 23 53.8   -13 27 47     4.190    3.243   13.9    4.2   314   21.7 
2025-12-10 06:55 UT   16 24 15.9   -13 28 31     4.188    3.241   14.1    4.2   314   21.7 
2025-12-11 00:00 UT   16 25 10.6   -13 30 20     4.181    3.237   14.5    4.4   312   21.7 
2025-12-12 00:00 UT   16 26 27.5   -13 32 50     4.171    3.230   15.1    4.5   311   21.6 
2025-12-13 00:00 UT   16 27 44.7   -13 35 17     4.161    3.224   15.7    4.7   309   21.6 
2025-12-14 00:00 UT   16 29 02.0   -13 37 41     4.151    3.218   16.3    4.9   308   21.6 
2025-12-15 00:00 UT   16 30 19.6   -13 40 01     4.141    3.211   16.9    5.1   307   21.6 
2025-12-16 00:00 UT   16 31 37.3   -13 42 17     4.130    3.205   17.5    5.3   305   21.6 
2025-12-17 00:00 UT   16 32 55.2   -13 44 31     4.120    3.199   18.1    5.5   304   21.6 
2025-12-18 00:00 UT   16 34 13.3   -13 46 41     4.109    3.192   18.8    5.7   303   21.6 
2025-12-19 00:00 UT   16 35 31.5   -13 48 47     4.098    3.186   19.4    5.9   302   21.6 
2025-12-20 00:00 UT   16 36 50.0   -13 50 50     4.086    3.180   20.0    6.1   301   21.6 

    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.