415P/Tenagra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	24 Aug 2026	21.6	4.623 AU	3.857 AU	01h15m	-10°35'	134.6°	9.0°	265°
Nearest approach	31 Jan 2029	19.2	3.349 AU	2.441 AU	08h04m	-06°36'	153.0°	7.7°	27°
Perihelion	14 Jun 2029	20.1	3.302 AU	3.834 AU	08h59m	+10°30'	51.7°	14.0°	111°

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. (12.0 + 5 log[∆] + 10.0 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 415P/Tenagra are:

    e (Eccentricity)                : 0.1959010
    q (Perihelion distance)         : 3.3018090
    i (Inclination)                 : 31.81820
    Ω (Longitude of ascending node) : 160.25890
    ω (Argument of perihelion)      : 346.00050
    L (Longitude of perihelion)     : 148.29751
    B (Latitude of perihelion)      : -7.32763
    T (Time of perihelion passage)  : 2462301.52480
    P (Orbital period in years)     : 8.32

    Epoch                           : 2026 Aug 13
    Reference                       : MPC191632

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.748

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-08-23 00:00 UT   01 15 40.7   -10 27 46     3.868    4.625  133.6    9.1   264   21.6 
2026-08-24 00:00 UT   01 15 30.9   -10 35 17     3.857    4.623  134.6    9.0   265   21.6 
2026-08-24 00:34 UT   01 15 30.6   -10 35 28     3.857    4.623  134.6    9.0   265   21.6 
2026-08-25 00:00 UT   01 15 20.2   -10 42 51     3.847    4.622  135.5    8.8   265   21.6 
2026-08-26 00:00 UT   01 15 08.8   -10 50 29     3.836    4.621  136.4    8.7   266   21.6 
2026-08-27 00:00 UT   01 14 56.6   -10 58 10     3.826    4.620  137.4    8.5   267   21.6 
2026-08-28 00:00 UT   01 14 43.6   -11 05 54     3.816    4.619  138.3    8.4   268   21.6 
2026-08-29 00:00 UT   01 14 29.8   -11 13 41     3.806    4.618  139.2    8.2   268   21.5 
2026-08-30 00:00 UT   01 14 15.2   -11 21 30     3.796    4.617  140.1    8.1   269   21.5 
2026-08-31 00:00 UT   01 13 59.9   -11 29 22     3.787    4.615  141.0    7.9   270   21.5 
2026-09-01 00:00 UT   01 13 43.8   -11 37 16     3.778    4.614  141.9    7.8   271   21.5 
2026-09-02 00:00 UT   01 13 27.0   -11 45 12     3.769    4.613  142.8    7.6   272   21.5 
2026-09-03 00:00 UT   01 13 09.4   -11 53 11     3.760    4.612  143.7    7.4   273   21.5 

    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.