C/2017 E2 (Tsuchinshan) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Nearest approach | 22 Oct 2015 | 18.3 | 3.133 AU | 2.314 AU | 23h29m | +38°23' | 139.0° | 12.0° | 123° |
Perihelion | 11 May 2016 | 17.3 | 2.350 AU | 2.675 AU | 01h20m | +76°52' | 60.6° | 22.0° | 328° |
Today | 10 Jul 2025 | 30.8 | 19.443 AU | 19.360 AU | 10h54m | -59°41' | 93.2° | 3.0° | 131° |
C/2017 E2 (Tsuchinshan)- 2025-07-10
astro.vanbuitenen.nl
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 C/2017 E2 (Tsuchinshan) are:
e (Eccentricity) : 0.8908419
q (Perihelion distance) : 2.3502008
i (Inclination) : 79.07641
Ω (Longitude of ascending node) : 11.61301
ω (Argument of perihelion) : 89.36233
L (Longitude of perihelion) : 98.25171
B (Latitude of perihelion) : 79.05804
T (Time of perihelion passage) : 2457520.07825
P (Orbital period in years) : 99.90
Epoch : 2020 Dec 17
Reference : MPEC 2020-SI8
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); Halley type (P < 200 years)
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 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. (11.50 + 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
2025-07-10 00:00 UT 10 54 47.0 -59 41 19 19.359 19.443 93.2 3.0 131 30.8
2025-07-10 00:50 UT 10 54 47.4 -59 41 15 19.360 19.443 93.2 3.0 131 30.8
2025-07-11 00:00 UT 10 54 58.7 -59 39 39 19.372 19.447 92.7 3.0 132 30.8
2025-07-12 00:00 UT 10 55 10.8 -59 38 02 19.384 19.451 92.2 3.0 133 30.8
2025-07-13 00:00 UT 10 55 23.1 -59 36 27 19.397 19.454 91.7 3.0 133 30.8
2025-07-14 00:00 UT 10 55 35.6 -59 34 54 19.409 19.458 91.2 3.0 134 30.8
2025-07-15 00:00 UT 10 55 48.4 -59 33 23 19.422 19.461 90.7 3.0 135 30.8
2025-07-16 00:00 UT 10 56 01.5 -59 31 54 19.435 19.465 90.2 3.0 136 30.8
2025-07-17 00:00 UT 10 56 14.8 -59 30 27 19.447 19.469 89.7 3.0 136 30.8
2025-07-18 00:00 UT 10 56 28.3 -59 29 03 19.460 19.472 89.2 3.0 137 30.8
2025-07-19 00:00 UT 10 56 42.1 -59 27 40 19.472 19.476 88.7 3.0 138 30.8
2025-07-20 00:00 UT 10 56 56.1 -59 26 20 19.485 19.480 88.2 3.0 139 30.8
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.