156P/Russell-LINEAR
Metadata
| Parameter | Value |
|---|---|
| Designation | 156P/Russell-LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-11-17T19:50:25.532160Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:33:39Z |
| Obs used | 2333 |
| NEO | - |
| M1 | 12.700 |
| K1 | 9.000 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-03-21.0000000 |
| e | 0.61492244 |
| q (au) | 1.333114 |
| a (au) | 3.461937 |
| i (deg) | 17.263540 |
| Ω (om, deg) | 35.396898 |
| ω (w, deg) | 0.378461 |
| M (ma, deg) | 322.997635 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.922 + 3.065\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.922 |
| n | 3.065 |
| gf | 1.000 |
| gb | -0.500 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2020-01-20 | 2020-07-21 | -49.3673 | +17.357 |
| 2020-07-21 | 2020-09-16 | +3.1689 | +2.883 |
| 2020-09-16 | 2020-11-17 | +72.1414 | -9.382 |
| 2020-11-17 | 2021-03-31 | -0.7137 | -0.628 |
| 2021-03-31 | 2022-03-31 | +7.9952 | -3.473 |
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 | 17:34:54.82 | -41:07:41.0 | HIP 86156 | 17.12 |
| 2026-09-20 12:00 | 17:35:21.28 | -41:05:36.6 | HIP 86156 | 13.36 |
| 2026-09-21 00:00 | 17:35:48.15 | -41:03:32.5 | HIP 86156 | 11.00 |
| 2026-09-21 12:00 | 17:36:15.44 | -41:01:28.6 | HIP 86156 | 11.08 |
| 2026-09-22 00:00 | 17:36:43.14 | -40:59:25.0 | HIP 86156 | 13.66 |
| 2026-09-22 12:00 | 17:37:11.26 | -40:57:21.6 | HIP 86269 | 9.89 |
| 2026-09-23 00:00 | 17:37:39.78 | -40:55:18.5 | HIP 86269 | 6.51 |
| 2026-09-23 12:00 | 17:38:08.71 | -40:53:15.6 | HIP 86269 | 7.38 |
| 2026-09-24 00:00 | 17:38:38.05 | -40:51:12.9 | HIP 86269 | 11.69 |
| 2026-09-24 12:00 | 17:39:07.79 | -40:49:10.5 | HIP 86269 | 17.07 |
| 2026-09-25 00:00 | 17:39:37.93 | -40:47:08.2 | HIP 86491 | 19.35 |
| 2026-09-25 12:00 | 17:40:08.46 | -40:45:06.1 | HIP 86491 | 15.17 |
| 2026-09-26 00:00 | 17:40:39.39 | -40:43:04.2 | HIP 86491 | 12.70 |
| 2026-09-26 12:00 | 17:41:10.72 | -40:41:02.5 | HIP 86491 | 13.08 |
| 2026-09-27 00:00 | 17:41:42.43 | -40:39:00.9 | HIP 86491 | 16.18 |
| 2026-09-27 12:00 | 17:42:14.54 | -40:36:59.5 | HIP 86694 | 18.98 |
| 2026-09-28 00:00 | 17:42:47.02 | -40:34:58.2 | HIP 86694 | 15.78 |
| 2026-09-28 12:00 | 17:43:19.90 | -40:32:57.1 | HIP 86694 | 14.93 |
| 2026-09-29 00:00 | 17:43:53.16 | -40:30:56.0 | HIP 86694 | 16.88 |
| 2026-09-29 12:00 | 17:44:26.79 | -40:28:55.1 | HIP 86694 | 20.94 |
| 2026-09-30 00:00 | 17:45:00.81 | -40:26:54.2 | HIP 86810 | 21.88 |
| 2026-09-30 12:00 | 17:45:35.20 | -40:24:53.4 | HIP 86965 | 20.50 |
| 2026-10-01 00:00 | 17:46:09.97 | -40:22:52.7 | HIP 86965 | 20.92 |
| 2026-10-01 12:00 | 17:46:45.11 | -40:20:52.1 | HIP 87073 | 16.32 |
| 2026-10-02 00:00 | 17:47:20.63 | -40:18:51.5 | HIP 87073 | 11.57 |
| 2026-10-02 12:00 | 17:47:56.51 | -40:16:50.9 | HIP 87073 | 10.10 |
| 2026-10-03 00:00 | 17:48:32.76 | -40:14:50.3 | HIP 87195 | 4.76 |
| 2026-10-03 12:00 | 17:49:09.38 | -40:12:49.7 | HIP 87195 | 6.24 |
| 2026-10-04 00:00 | 17:49:46.36 | -40:10:49.2 | HIP 87294 | 7.17 |
| 2026-10-04 12:00 | 17:50:23.71 | -40:08:48.6 | HIP 87294 | 4.15 |
| 2026-10-05 00:00 | 17:51:01.41 | -40:06:47.9 | HIP 87294 | 9.72 |
| 2026-10-05 12:00 | 17:51:39.48 | -40:04:47.2 | HIP 87294 | 16.91 |
| 2026-10-06 00:00 | 17:52:17.91 | -40:02:46.5 | HIP 87294 | 24.40 |
| 2026-10-06 12:00 | 17:52:56.69 | -40:00:45.7 | HIP 87688 | 24.25 |
| 2026-10-07 00:00 | 17:53:35.82 | -39:58:44.8 | HIP 87688 | 20.36 |
| 2026-10-07 12:00 | 17:54:15.31 | -39:56:43.7 | HIP 87688 | 18.98 |
| 2026-10-08 00:00 | 17:54:55.15 | -39:54:42.6 | HIP 87688 | 20.71 |
| 2026-10-08 12:00 | 17:55:35.34 | -39:52:41.3 | HIP 87854 | 14.85 |
| 2026-10-09 00:00 | 17:56:15.87 | -39:50:39.9 | HIP 87854 | 8.55 |
| 2026-10-09 12:00 | 17:56:56.75 | -39:48:38.3 | HIP 87854 | 7.41 |
| 2026-10-10 00:00 | 17:57:37.98 | -39:46:36.6 | HIP 87854 | 13.01 |
| 2026-10-10 12:00 | 17:58:19.54 | -39:44:34.7 | HIP 87854 | 20.48 |
| 2026-10-11 00:00 | 17:59:01.44 | -39:42:32.5 | HIP 87854 | 28.44 |