|
C/2017 D2 (Barros) |
| ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
| Perihelion | 14 Jul 2017 | 15.4 | 2.500 AU | 1.595 AU | 22h01m | -33°53' | 145.6° | 13.3° | 281° |
| Nearest approach | 7 Aug 2017 | 15.3 | 2.514 AU | 1.520 AU | 21h39m | -29°21' | 165.3° | 5.9° | 330° |
| Today | 17 Nov 2025 | 30.1 | 20.916 AU | 20.198 AU | 06h02m | +52°46' | 135.5° | 1.9° | 235° |
C/2017 D2 (Barros)- 2025-11-17
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.)
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.
This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 10.4 + 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 C/2017 D2 (Barros) are:
e (Eccentricity) : 0.9998490
q (Perihelion distance) : 2.5000880
i (Inclination) : 31.25650
Ω (Longitude of ascending node) : 330.95930
ω (Argument of perihelion) : 334.65390
L (Longitude of perihelion) : 308.91485
B (Latitude of perihelion) : -12.83362
T (Time of perihelion passage) : 2457948.99800
Epoch : 2022 Jul 23
Reference : MPC112391
Classification(s): : Nearly isotropic; New (a > 10000 AU)
Ephemerides
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-11-16 00:00 UT 06 03 09.3 +52 45 25 20.205 20.906 134.1 1.9 237 30.1
2025-11-17 00:00 UT 06 02 55.3 +52 46 11 20.201 20.911 134.9 1.9 236 30.1
2025-11-17 20:47 UT 06 02 43.0 +52 46 49 20.198 20.916 135.5 1.9 235 30.1
2025-11-18 00:00 UT 06 02 41.1 +52 46 55 20.198 20.916 135.6 1.9 235 30.1
2025-11-19 00:00 UT 06 02 26.6 +52 47 38 20.194 20.921 136.4 1.9 234 30.1
2025-11-20 00:00 UT 06 02 12.0 +52 48 20 20.191 20.926 137.1 1.8 233 30.1
2025-11-21 00:00 UT 06 01 57.2 +52 49 01 20.188 20.931 137.8 1.8 232 30.1
2025-11-22 00:00 UT 06 01 42.1 +52 49 40 20.186 20.936 138.5 1.8 231 30.1
2025-11-23 00:00 UT 06 01 26.9 +52 50 18 20.183 20.941 139.2 1.8 229 30.1
2025-11-24 00:00 UT 06 01 11.5 +52 50 54 20.181 20.946 139.9 1.7 228 30.1
2025-11-25 00:00 UT 06 00 56.0 +52 51 29 20.179 20.951 140.6 1.7 227 30.1
2025-11-26 00:00 UT 06 00 40.3 +52 52 02 20.177 20.956 141.2 1.7 225 30.1
2025-11-27 00:00 UT 06 00 24.4 +52 52 34 20.176 20.961 141.9 1.7 224 30.1
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.
