C/2023 T3 (Fuls)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2023 T3 (Fuls) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-01-25T08:15:42.802560Z |
| Orbit solution date (soln_date, UTC) | 2026-07-16T19:12:18Z |
| Obs used | 1367 |
| 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 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-11-10.0000000 |
| e | 0.99539803 |
| q (au) | 3.548298 |
| a (au) | 771.038375 |
| i (deg) | 27.222056 |
| Ω (om, deg) | 246.000476 |
| ω (w, deg) | 302.847226 |
| M (ma, deg) | 359.996485 |
Magnitude
Scatter + Global Linear
$$ M_a = (10.112 + 3.391\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 10.112 |
| n | 3.391 |
| gf | 0.961 |
| gb | -0.520 |
| k | 0.800 |
| δ90 | 8.518 |
| 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 | 2024-03-09 | +10.8997 | -7.529 |
| 2024-03-09 | 2025-01-24 | -2.4934 | +1.361 |
| 2025-01-26 | 2025-08-23 | -8.4094 | +4.780 |
| 2025-08-23 | 2026-07-12 | +6.4360 | -4.424 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:17:11.95 | -11:54:42.3 | HIP 84487 | 20.39 |
| 2026-09-20 12:00 | 17:17:23.09 | -11:54:53.7 | HIP 84487 | 22.05 |
| 2026-09-21 00:00 | 17:17:34.34 | -11:55:05.2 | HIP 84729 | 23.67 |
| 2026-09-21 12:00 | 17:17:45.71 | -11:55:16.7 | HIP 84729 | 20.90 |
| 2026-09-22 00:00 | 17:17:57.21 | -11:55:28.2 | HIP 84729 | 18.11 |
| 2026-09-22 12:00 | 17:18:08.83 | -11:55:39.8 | HIP 84729 | 15.29 |
| 2026-09-23 00:00 | 17:18:20.56 | -11:55:51.4 | HIP 84729 | 12.46 |
| 2026-09-23 12:00 | 17:18:32.41 | -11:56:03.0 | HIP 84729 | 9.63 |
| 2026-09-24 00:00 | 17:18:44.39 | -11:56:14.6 | HIP 84729 | 6.84 |
| 2026-09-24 12:00 | 17:18:56.47 | -11:56:26.3 | HIP 84729 | 4.21 |
| 2026-09-25 00:00 | 17:19:08.68 | -11:56:37.9 | HIP 84729 | 2.52 |
| 2026-09-25 12:00 | 17:19:21.00 | -11:56:49.6 | HIP 84729 | 3.60 |
| 2026-09-26 00:00 | 17:19:33.43 | -11:57:01.2 | HIP 84729 | 6.18 |
| 2026-09-26 12:00 | 17:19:45.98 | -11:57:12.8 | HIP 84729 | 9.08 |
| 2026-09-27 00:00 | 17:19:58.64 | -11:57:24.4 | HIP 84729 | 12.09 |
| 2026-09-27 12:00 | 17:20:11.41 | -11:57:36.0 | HIP 84729 | 15.17 |
| 2026-09-28 00:00 | 17:20:24.29 | -11:57:47.6 | HIP 84913 | 12.87 |
| 2026-09-28 12:00 | 17:20:37.29 | -11:57:59.2 | HIP 84913 | 10.00 |
| 2026-09-29 00:00 | 17:20:50.40 | -11:58:10.7 | HIP 84913 | 7.38 |
| 2026-09-29 12:00 | 17:21:03.61 | -11:58:22.1 | HIP 84928 | 4.72 |
| 2026-09-30 00:00 | 17:21:16.93 | -11:58:33.6 | HIP 84928 | 2.12 |
| 2026-09-30 12:00 | 17:21:30.37 | -11:58:45.0 | HIP 84928 | 2.84 |
| 2026-10-01 00:00 | 17:21:43.91 | -11:58:56.3 | HIP 84928 | 5.79 |
| 2026-10-01 12:00 | 17:21:57.56 | -11:59:07.6 | HIP 84928 | 9.03 |
| 2026-10-02 00:00 | 17:22:11.31 | -11:59:18.8 | HIP 84928 | 12.35 |
| 2026-10-02 12:00 | 17:22:25.17 | -11:59:29.9 | HIP 84928 | 15.71 |
| 2026-10-03 00:00 | 17:22:39.13 | -11:59:41.0 | HIP 84928 | 19.12 |
| 2026-10-03 12:00 | 17:22:53.20 | -11:59:52.0 | HIP 84928 | 22.55 |
| 2026-10-04 00:00 | 17:23:07.38 | -12:00:03.0 | HIP 85151 | 22.48 |
| 2026-10-04 12:00 | 17:23:21.65 | -12:00:13.8 | HIP 85151 | 20.72 |
| 2026-10-05 00:00 | 17:23:36.03 | -12:00:24.6 | HIP 85151 | 19.43 |
| 2026-10-05 12:00 | 17:23:50.51 | -12:00:35.2 | HIP 85151 | 18.71 |
| 2026-10-06 00:00 | 17:24:05.10 | -12:00:45.8 | HIP 85151 | 18.66 |
| 2026-10-06 12:00 | 17:24:19.78 | -12:00:56.2 | HIP 85151 | 19.28 |
| 2026-10-07 00:00 | 17:24:34.56 | -12:01:06.6 | HIP 85151 | 20.52 |
| 2026-10-07 12:00 | 17:24:49.44 | -12:01:16.8 | HIP 85151 | 22.31 |
| 2026-10-08 00:00 | 17:25:04.42 | -12:01:26.9 | HIP 85151 | 24.52 |
| 2026-10-08 12:00 | 17:25:19.50 | -12:01:36.9 | HIP 85151 | 27.06 |
| 2026-10-09 00:00 | 17:25:34.68 | -12:01:46.8 | HIP 85151 | 29.87 |
| 2026-10-09 12:00 | 17:25:49.95 | -12:01:56.5 | HIP 85455 | 30.30 |
| 2026-10-10 00:00 | 17:26:05.31 | -12:02:06.1 | HIP 85455 | 26.69 |
| 2026-10-10 12:00 | 17:26:20.78 | -12:02:15.6 | HIP 85455 | 23.11 |
| 2026-10-11 00:00 | 17:26:36.33 | -12:02:24.9 | HIP 85455 | 19.59 |