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 | 1.000 |
| 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 | 2023-01-23 | +18.9647 | -3.987 |
| 2023-01-23 | 2023-04-13 | -1.8941 | +2.281 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 18:20:31.60 | -27:53:41.1 | HIP 89871 | 29.32 |
| 2026-06-01 12:00 | 18:20:13.45 | -27:53:38.9 | HIP 89871 | 29.24 |
| 2026-06-02 00:00 | 18:19:55.18 | -27:53:36.3 | HIP 89871 | 29.71 |
| 2026-06-02 12:00 | 18:19:36.78 | -27:53:33.5 | HIP 89871 | 30.71 |
| 2026-06-03 00:00 | 18:19:18.26 | -27:53:30.2 | HIP 89871 | 32.21 |
| 2026-06-03 12:00 | 18:18:59.62 | -27:53:26.7 | HIP 89592 | 28.98 |
| 2026-06-04 00:00 | 18:18:40.85 | -27:53:22.7 | HIP 89592 | 25.13 |
| 2026-06-04 12:00 | 18:18:21.97 | -27:53:18.4 | HIP 89592 | 21.37 |
| 2026-06-05 00:00 | 18:18:02.98 | -27:53:13.7 | HIP 89592 | 17.77 |
| 2026-06-05 12:00 | 18:17:43.87 | -27:53:08.6 | HIP 89592 | 14.47 |
| 2026-06-06 00:00 | 18:17:24.65 | -27:53:03.2 | HIP 89592 | 11.77 |
| 2026-06-06 12:00 | 18:17:05.33 | -27:52:57.4 | HIP 89592 | 10.17 |
| 2026-06-07 00:00 | 18:16:45.90 | -27:52:51.1 | HIP 89592 | 10.24 |
| 2026-06-07 12:00 | 18:16:26.37 | -27:52:44.5 | HIP 89592 | 11.98 |
| 2026-06-08 00:00 | 18:16:06.74 | -27:52:37.5 | HIP 89592 | 14.83 |
| 2026-06-08 12:00 | 18:15:47.01 | -27:52:30.1 | HIP 89396 | 16.78 |
| 2026-06-09 00:00 | 18:15:27.19 | -27:52:22.3 | HIP 89396 | 12.90 |
| 2026-06-09 12:00 | 18:15:07.28 | -27:52:14.0 | HIP 89396 | 9.45 |
| 2026-06-10 00:00 | 18:14:47.29 | -27:52:05.4 | HIP 89396 | 7.13 |
| 2026-06-10 12:00 | 18:14:27.20 | -27:51:56.3 | HIP 89396 | 7.19 |
| 2026-06-11 00:00 | 18:14:07.04 | -27:51:46.9 | HIP 89396 | 9.61 |
| 2026-06-11 12:00 | 18:13:46.79 | -27:51:37.0 | HIP 89396 | 13.16 |
| 2026-06-12 00:00 | 18:13:26.47 | -27:51:26.6 | HIP 89396 | 17.17 |
| 2026-06-12 12:00 | 18:13:06.08 | -27:51:15.9 | HIP 89396 | 21.39 |
| 2026-06-13 00:00 | 18:12:45.61 | -27:51:04.7 | HIP 89238 | 23.17 |
| 2026-06-13 12:00 | 18:12:25.08 | -27:50:53.1 | HIP 89238 | 23.45 |
| 2026-06-14 00:00 | 18:12:04.49 | -27:50:41.0 | HIP 89088 | 20.25 |
| 2026-06-14 12:00 | 18:11:43.83 | -27:50:28.5 | HIP 89088 | 17.31 |
| 2026-06-15 00:00 | 18:11:23.12 | -27:50:15.6 | HIP 89088 | 15.20 |
| 2026-06-15 12:00 | 18:11:02.35 | -27:50:02.2 | HIP 89088 | 14.30 |
| 2026-06-16 00:00 | 18:10:41.54 | -27:49:48.3 | HIP 89088 | 14.84 |
| 2026-06-16 12:00 | 18:10:20.67 | -27:49:34.1 | HIP 89088 | 16.70 |
| 2026-06-17 00:00 | 18:09:59.76 | -27:49:19.3 | HIP 88906 | 14.69 |
| 2026-06-17 12:00 | 18:09:38.82 | -27:49:04.1 | HIP 88906 | 10.08 |
| 2026-06-18 00:00 | 18:09:17.83 | -27:48:48.5 | HIP 88906 | 5.53 |
| 2026-06-18 12:00 | 18:08:56.81 | -27:48:32.4 | HIP 88906 | 1.63 |
| 2026-06-19 00:00 | 18:08:35.76 | -27:48:15.9 | HIP 88864 | 3.59 |
| 2026-06-19 12:00 | 18:08:14.68 | -27:47:58.8 | HIP 88864 | 5.89 |
| 2026-06-20 00:00 | 18:07:53.58 | -27:47:41.4 | HIP 88864 | 10.02 |
| 2026-06-20 12:00 | 18:07:32.46 | -27:47:23.5 | HIP 88864 | 14.48 |
| 2026-06-21 00:00 | 18:07:11.32 | -27:47:05.1 | HIP 88864 | 19.06 |
| 2026-06-21 12:00 | 18:06:50.16 | -27:46:46.2 | HIP 88683 | 19.01 |
| 2026-06-22 00:00 | 18:06:29.00 | -27:46:26.9 | HIP 88683 | 17.23 |