C/2023 T3 (Fuls)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2023 T3 (Fuls) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-01-25T08:17:05.772480Z |
| Orbit solution date (soln_date, UTC) | 2025-09-30T13:39:26Z |
| Obs used | 1353 |
| NEO | - |
| M1 | 10.000 |
| K1 | 7.250 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2023-10-15T11:19:47.798400Z |
| Discovery magnitude (MPC) | 18.55 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-11-04.0000000 |
| e | 0.99538566 |
| q (au) | 3.548297 |
| a (au) | 768.971968 |
| i (deg) | 27.222047 |
| Ω (om, deg) | 246.000530 |
| ω (w, deg) | 302.847329 |
| M (ma, deg) | 359.996194 |
Magnitude
Scatter + Global Linear
$$ M_a = (8.946 + 3.302\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 8.946 |
| n | 3.302 |
| gf | 0.884 |
| gb | -1.000 |
| k | 1.000 |
| δ90 | 1.000 |
| Parameter | Symbol | Range | Description |
|---|---|---|---|
| Absolute magnitude at 1 AU from Sun and Earth | H0 | -5 to 20 | Intrinsic brightness of the comet |
| Photometric slope parameter | n | 2 to 6 | Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor | gf |
0.8 to 1 | Degree of forward scattering |
| Backward scattering asymmetry factor | gb |
-1 to -0.5 | Degree of backward scattering |
| Partitioning coefficient | k | 0.8 to 1 | Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio | δ90 | 1 to 10 | Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2023-09-09 | 2024-02-27 | +9.6795 | -6.655 |
| 2024-02-27 | 2025-01-24 | -2.8567 | +1.577 |
| 2025-01-26 | 2025-09-09 | -9.8222 | +5.570 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 17:17:38.59 | -20:54:41.8 | HIP 84693 | 23.02 |
| 2026-02-03 12:00 | 17:18:03.42 | -20:53:34.4 | HIP 84693 | 18.40 |
| 2026-02-04 00:00 | 17:18:28.11 | -20:52:26.5 | HIP 84693 | 14.73 |
| 2026-02-04 12:00 | 17:18:52.66 | -20:51:18.0 | HIP 84693 | 12.83 |
| 2026-02-05 00:00 | 17:19:17.06 | -20:50:09.1 | HIP 84693 | 13.41 |
| 2026-02-05 12:00 | 17:19:41.33 | -20:48:59.5 | HIP 84693 | 16.18 |
| 2026-02-06 00:00 | 17:20:05.45 | -20:47:49.4 | HIP 84719 | 20.09 |
| 2026-02-06 12:00 | 17:20:29.43 | -20:46:38.8 | HIP 84893 | 21.35 |
| 2026-02-07 00:00 | 17:20:53.26 | -20:45:27.7 | HIP 84958 | 17.71 |
| 2026-02-07 12:00 | 17:21:16.94 | -20:44:16.0 | HIP 84958 | 12.95 |
| 2026-02-08 00:00 | 17:21:40.48 | -20:43:03.8 | HIP 84958 | 9.27 |
| 2026-02-08 12:00 | 17:22:03.88 | -20:41:51.0 | HIP 84958 | 8.21 |
| 2026-02-09 00:00 | 17:22:27.12 | -20:40:37.7 | HIP 84958 | 10.53 |
| 2026-02-09 12:00 | 17:22:50.21 | -20:39:23.9 | HIP 84958 | 14.69 |
| 2026-02-10 00:00 | 17:23:13.16 | -20:38:09.6 | HIP 84958 | 19.51 |
| 2026-02-10 12:00 | 17:23:35.95 | -20:36:54.7 | HIP 84958 | 24.58 |
| 2026-02-11 00:00 | 17:23:58.59 | -20:35:39.4 | HIP 85053 | 26.98 |
| 2026-02-11 12:00 | 17:24:21.08 | -20:34:23.4 | HIP 85053 | 29.20 |
| 2026-02-12 00:00 | 17:24:43.42 | -20:33:07.0 | HIP 85053 | 32.15 |
| 2026-02-12 12:00 | 17:25:05.60 | -20:31:50.1 | HIP 85426 | 32.14 |
| 2026-02-13 00:00 | 17:25:27.62 | -20:30:32.6 | HIP 85426 | 26.98 |
| 2026-02-13 12:00 | 17:25:49.49 | -20:29:14.6 | HIP 85426 | 21.93 |
| 2026-02-14 00:00 | 17:26:11.20 | -20:27:56.2 | HIP 85426 | 17.05 |
| 2026-02-14 12:00 | 17:26:32.75 | -20:26:37.2 | HIP 85426 | 12.52 |
| 2026-02-15 00:00 | 17:26:54.15 | -20:25:17.7 | HIP 85426 | 8.83 |
| 2026-02-15 12:00 | 17:27:15.38 | -20:23:57.7 | HIP 85426 | 7.27 |
| 2026-02-16 00:00 | 17:27:36.45 | -20:22:37.1 | HIP 85426 | 8.99 |
| 2026-02-16 12:00 | 17:27:57.36 | -20:21:16.1 | HIP 85502 | 6.22 |
| 2026-02-17 00:00 | 17:28:18.11 | -20:19:54.6 | HIP 85502 | 2.34 |
| 2026-02-17 12:00 | 17:28:38.69 | -20:18:32.6 | HIP 85502 | 4.80 |
| 2026-02-18 00:00 | 17:28:59.11 | -20:17:10.1 | HIP 85502 | 9.50 |
| 2026-02-18 12:00 | 17:29:19.37 | -20:15:47.1 | HIP 85502 | 14.36 |
| 2026-02-19 00:00 | 17:29:39.45 | -20:14:23.7 | HIP 85502 | 19.23 |
| 2026-02-19 12:00 | 17:29:59.37 | -20:12:59.7 | HIP 85502 | 24.09 |
| 2026-02-20 00:00 | 17:30:19.13 | -20:11:35.3 | HIP 85502 | 28.92 |
| 2026-02-20 12:00 | 17:30:38.71 | -20:10:10.3 | HIP 85814 | 32.02 |
| 2026-02-21 00:00 | 17:30:58.13 | -20:08:44.9 | HIP 85814 | 30.57 |
| 2026-02-21 12:00 | 17:31:17.37 | -20:07:19.1 | HIP 85814 | 29.84 |
| 2026-02-22 00:00 | 17:31:36.45 | -20:05:52.7 | HIP 85916 | 26.52 |
| 2026-02-22 12:00 | 17:31:55.35 | -20:04:25.9 | HIP 85916 | 21.87 |
| 2026-02-23 00:00 | 17:32:14.08 | -20:02:58.6 | HIP 85916 | 17.27 |
| 2026-02-23 12:00 | 17:32:32.64 | -20:01:30.9 | HIP 85916 | 12.73 |
| 2026-02-24 00:00 | 17:32:51.02 | -20:00:02.7 | HIP 85916 | 8.28 |