434P/Tenagra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	15 May 2026	23.4	5.248 AU	4.269 AU	16h26m	-27°02'	164.1°	3.0°	298°
Nearest approach	21 Oct 2029	19.6	3.112 AU	2.127 AU	01h11m	+17°32'	169.8°	3.3°	132°
Perihelion	27 Mar 2030	20.6	3.004 AU	3.715 AU	02h47m	+20°18'	38.9°	12.0°	68°

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. (13.0 + 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 434P/Tenagra are:

    e (Eccentricity)                : 0.2738510
    q (Perihelion distance)         : 3.0044730
    i (Inclination)                 : 6.33650
    Ω (Longitude of ascending node) : 288.90930
    ω (Argument of perihelion)      : 128.48680
    L (Longitude of perihelion)     : 237.56725
    B (Latitude of perihelion)      : 4.95598
    T (Time of perihelion passage)  : 2462588.31330
    P (Orbital period in years)     : 8.42

    Epoch                           : 2026 May 14
    Reference                       : MPC191634

    Classification(s):              : Ecliptic; Jupiter family; Quasi-Hilda
    Tisserand (Jupiter)             : 2.962

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-05-14 00:00 UT   16 26 44.6   -27 04 28     4.275    5.248  162.8    3.3   297   23.4 
2026-05-15 00:00 UT   16 26 09.3   -27 03 07     4.270    5.248  163.8    3.1   298   23.4 
2026-05-15 05:40 UT   16 26 00.9   -27 02 48     4.269    5.248  164.1    3.0   298   23.4 
2026-05-16 00:00 UT   16 25 33.6   -27 01 44     4.265    5.248  164.9    2.9   299   23.3 
2026-05-17 00:00 UT   16 24 57.7   -27 00 19     4.261    5.247  165.9    2.7   301   23.3 
2026-05-18 00:00 UT   16 24 21.4   -26 58 51     4.257    5.247  166.9    2.5   303   23.3 
2026-05-19 00:00 UT   16 23 44.9   -26 57 20     4.253    5.247  167.9    2.3   305   23.3 
2026-05-20 00:00 UT   16 23 08.2   -26 55 47     4.250    5.246  168.9    2.1   308   23.3 
2026-05-21 00:00 UT   16 22 31.3   -26 54 12     4.247    5.246  169.8    2.0   311   23.3 
2026-05-22 00:00 UT   16 21 54.3   -26 52 34     4.244    5.246  170.8    1.8   314   23.3 
2026-05-23 00:00 UT   16 21 17.1   -26 50 55     4.241    5.245  171.6    1.6   319   23.3 
2026-05-24 00:00 UT   16 20 39.7   -26 49 12     4.239    5.245  172.5    1.5   324   23.3 
2026-05-25 00:00 UT   16 20 02.3   -26 47 28     4.237    5.244  173.2    1.3   330   23.3 

    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.