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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 18:30:27.96 | -27:51:33.8 | HIP 90739 | 7.93 |
| 2026-05-12 12:00 | 18:30:16.60 | -27:51:40.5 | HIP 90739 | 9.83 |
| 2026-05-13 00:00 | 18:30:05.03 | -27:51:47.1 | HIP 90611 | 11.43 |
| 2026-05-13 12:00 | 18:29:53.27 | -27:51:53.5 | HIP 90611 | 9.33 |
| 2026-05-14 00:00 | 18:29:41.31 | -27:51:59.9 | HIP 90611 | 7.53 |
| 2026-05-14 12:00 | 18:29:29.15 | -27:52:06.1 | HIP 90611 | 6.33 |
| 2026-05-15 00:00 | 18:29:16.79 | -27:52:12.2 | HIP 90611 | 6.17 |
| 2026-05-15 12:00 | 18:29:04.24 | -27:52:18.2 | HIP 90611 | 7.17 |
| 2026-05-16 00:00 | 18:28:51.50 | -27:52:24.1 | HIP 90611 | 8.98 |
| 2026-05-16 12:00 | 18:28:38.56 | -27:52:29.8 | HIP 90611 | 11.25 |
| 2026-05-17 00:00 | 18:28:25.44 | -27:52:35.3 | HIP 90611 | 13.79 |
| 2026-05-17 12:00 | 18:28:12.12 | -27:52:40.7 | HIP 90611 | 16.48 |
| 2026-05-18 00:00 | 18:27:58.62 | -27:52:46.0 | HIP 90611 | 19.29 |
| 2026-05-18 12:00 | 18:27:44.93 | -27:52:51.1 | HIP 90611 | 22.19 |
| 2026-05-19 00:00 | 18:27:31.05 | -27:52:56.0 | HIP 90348 | 19.64 |
| 2026-05-19 12:00 | 18:27:17.00 | -27:53:00.7 | HIP 90348 | 16.68 |
| 2026-05-20 00:00 | 18:27:02.76 | -27:53:05.2 | HIP 90348 | 13.75 |
| 2026-05-20 12:00 | 18:26:48.34 | -27:53:09.5 | HIP 90348 | 10.91 |
| 2026-05-21 00:00 | 18:26:33.75 | -27:53:13.7 | HIP 90348 | 8.29 |
| 2026-05-21 12:00 | 18:26:18.98 | -27:53:17.6 | HIP 90348 | 6.24 |
| 2026-05-22 00:00 | 18:26:04.03 | -27:53:21.3 | HIP 90348 | 5.52 |
| 2026-05-22 12:00 | 18:25:48.92 | -27:53:24.8 | HIP 90348 | 6.63 |
| 2026-05-23 00:00 | 18:25:33.63 | -27:53:28.1 | HIP 90348 | 8.97 |
| 2026-05-23 12:00 | 18:25:18.18 | -27:53:31.1 | HIP 90348 | 11.85 |
| 2026-05-24 00:00 | 18:25:02.56 | -27:53:33.9 | HIP 90348 | 14.99 |
| 2026-05-24 12:00 | 18:24:46.77 | -27:53:36.4 | HIP 90154 | 14.30 |
| 2026-05-25 00:00 | 18:24:30.82 | -27:53:38.7 | HIP 90154 | 11.44 |
| 2026-05-25 12:00 | 18:24:14.71 | -27:53:40.8 | HIP 90154 | 9.04 |
| 2026-05-26 00:00 | 18:23:58.45 | -27:53:42.5 | HIP 90154 | 7.60 |
| 2026-05-26 12:00 | 18:23:42.02 | -27:53:44.0 | HIP 90154 | 7.73 |
| 2026-05-27 00:00 | 18:23:25.44 | -27:53:45.3 | HIP 90154 | 9.40 |
| 2026-05-27 12:00 | 18:23:08.71 | -27:53:46.2 | HIP 90154 | 12.02 |
| 2026-05-28 00:00 | 18:22:51.83 | -27:53:46.9 | HIP 90154 | 15.12 |
| 2026-05-28 12:00 | 18:22:34.80 | -27:53:47.2 | HIP 90154 | 18.49 |
| 2026-05-29 00:00 | 18:22:17.62 | -27:53:47.3 | HIP 90154 | 22.01 |
| 2026-05-29 12:00 | 18:22:00.30 | -27:53:47.0 | HIP 90154 | 25.64 |
| 2026-05-30 00:00 | 18:21:42.83 | -27:53:46.5 | HIP 90154 | 29.36 |
| 2026-05-30 12:00 | 18:21:25.23 | -27:53:45.6 | HIP 89871 | 32.56 |
| 2026-05-31 00:00 | 18:21:07.49 | -27:53:44.4 | HIP 89871 | 31.03 |
| 2026-05-31 12:00 | 18:20:49.61 | -27:53:42.9 | HIP 89871 | 29.93 |
| 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 |