157P/Tritton
Metadata
| Parameter | Value |
|---|---|
| Designation | 157P/Tritton |
| Type | P |
| Perihelion (tp_cal, UTC) | 2022-08-02T01:39:34.369920Z |
| Orbit solution date (soln_date, UTC) | 2024-02-22T12:32:46Z |
| Obs used | 434 |
| NEO | Yes |
| M1 | 15.200 |
| K1 | 4.500 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-01-28.0000000 |
| e | 0.62745613 |
| q (au) | 1.254895 |
| a (au) | 3.368450 |
| i (deg) | 11.182660 |
| Ω (om, deg) | 289.427253 |
| ω (w, deg) | 157.441955 |
| M (ma, deg) | 213.795421 |
Magnitude
Scatter + Global Linear
$$ M_a = (15.000 + 4.182\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 15.000 |
| n | 4.182 |
| gf | 0.999 |
| gb | -0.518 |
| k | 0.800 |
| δ90 | 10.000 |
| 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 |
|---|---|---|---|
| 2021-07-17 | 2022-07-28 | -0.9870 | -0.126 |
| 2022-08-02 | 2023-01-28 | +17.9787 | -3.782 |
| 2023-01-28 | 2023-04-13 | +0.5383 | +1.363 |
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 | 18:05:27.82 | -27:51:18.2 | HIP 88683 | 24.01 |
| 2026-02-03 12:00 | 18:05:49.94 | -27:51:13.6 | HIP 88683 | 22.30 |
| 2026-02-04 00:00 | 18:06:11.98 | -27:51:09.0 | HIP 88683 | 21.60 |
| 2026-02-04 12:00 | 18:06:33.92 | -27:51:04.2 | HIP 88683 | 21.97 |
| 2026-02-05 00:00 | 18:06:55.78 | -27:50:59.4 | HIP 88864 | 21.90 |
| 2026-02-05 12:00 | 18:07:17.54 | -27:50:54.6 | HIP 88864 | 17.10 |
| 2026-02-06 00:00 | 18:07:39.21 | -27:50:49.6 | HIP 88864 | 12.33 |
| 2026-02-06 12:00 | 18:08:00.79 | -27:50:44.6 | HIP 88864 | 7.60 |
| 2026-02-07 00:00 | 18:08:22.27 | -27:50:39.6 | HIP 88864 | 3.01 |
| 2026-02-07 12:00 | 18:08:43.66 | -27:50:34.5 | HIP 88864 | 2.34 |
| 2026-02-08 00:00 | 18:09:04.95 | -27:50:29.3 | HIP 88906 | 4.21 |
| 2026-02-08 12:00 | 18:09:26.14 | -27:50:24.1 | HIP 88906 | 7.84 |
| 2026-02-09 00:00 | 18:09:47.24 | -27:50:18.9 | HIP 88906 | 12.19 |
| 2026-02-09 12:00 | 18:10:08.24 | -27:50:13.6 | HIP 88906 | 16.69 |
| 2026-02-10 00:00 | 18:10:29.13 | -27:50:08.2 | HIP 89088 | 15.37 |
| 2026-02-10 12:00 | 18:10:49.92 | -27:50:02.9 | HIP 89088 | 14.30 |
| 2026-02-11 00:00 | 18:11:10.62 | -27:49:57.4 | HIP 89088 | 14.65 |
| 2026-02-11 12:00 | 18:11:31.20 | -27:49:52.0 | HIP 89088 | 16.32 |
| 2026-02-12 00:00 | 18:11:51.69 | -27:49:46.5 | HIP 89088 | 18.94 |
| 2026-02-12 12:00 | 18:12:12.07 | -27:49:40.9 | HIP 89088 | 22.17 |
| 2026-02-13 00:00 | 18:12:32.34 | -27:49:35.4 | HIP 89238 | 24.61 |
| 2026-02-13 12:00 | 18:12:52.50 | -27:49:29.8 | HIP 89396 | 24.83 |
| 2026-02-14 00:00 | 18:13:12.56 | -27:49:24.2 | HIP 89396 | 20.83 |
| 2026-02-14 12:00 | 18:13:32.50 | -27:49:18.5 | HIP 89396 | 17.07 |
| 2026-02-15 00:00 | 18:13:52.34 | -27:49:12.8 | HIP 89396 | 13.72 |
| 2026-02-15 12:00 | 18:14:12.06 | -27:49:07.2 | HIP 89396 | 11.12 |
| 2026-02-16 00:00 | 18:14:31.67 | -27:49:01.5 | HIP 89396 | 9.86 |
| 2026-02-16 12:00 | 18:14:51.17 | -27:48:55.7 | HIP 89396 | 10.40 |
| 2026-02-17 00:00 | 18:15:10.55 | -27:48:50.0 | HIP 89396 | 12.49 |
| 2026-02-17 12:00 | 18:15:29.82 | -27:48:44.3 | HIP 89396 | 15.48 |
| 2026-02-18 00:00 | 18:15:48.96 | -27:48:38.5 | HIP 89592 | 16.20 |
| 2026-02-18 12:00 | 18:16:07.99 | -27:48:32.8 | HIP 89592 | 12.30 |
| 2026-02-19 00:00 | 18:16:26.90 | -27:48:27.0 | HIP 89592 | 8.73 |
| 2026-02-19 12:00 | 18:16:45.70 | -27:48:21.3 | HIP 89592 | 6.01 |
| 2026-02-20 00:00 | 18:17:04.37 | -27:48:15.5 | HIP 89592 | 5.53 |
| 2026-02-20 12:00 | 18:17:22.91 | -27:48:09.8 | HIP 89592 | 7.68 |
| 2026-02-21 00:00 | 18:17:41.34 | -27:48:04.0 | HIP 89592 | 10.97 |
| 2026-02-21 12:00 | 18:17:59.64 | -27:47:58.3 | HIP 89592 | 14.64 |
| 2026-02-22 00:00 | 18:18:17.81 | -27:47:52.6 | HIP 89592 | 18.44 |
| 2026-02-22 12:00 | 18:18:35.86 | -27:47:46.9 | HIP 89592 | 22.30 |
| 2026-02-23 00:00 | 18:18:53.78 | -27:47:41.2 | HIP 89592 | 26.16 |
| 2026-02-23 12:00 | 18:19:11.58 | -27:47:35.5 | HIP 89871 | 27.80 |
| 2026-02-24 00:00 | 18:19:29.25 | -27:47:29.8 | HIP 89871 | 25.75 |