156P/Russell-LINEAR
Metadata
| Parameter | Value |
|---|---|
| Designation | 156P/Russell-LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-11-17T19:49:56.294400Z |
| Orbit solution date (soln_date, UTC) | 2023-05-03T22:44:05Z |
| Obs used | 2317 |
| NEO | - |
| M1 | 12.700 |
| K1 | 9.000 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-03-20.0000000 |
| e | 0.61492390 |
| q (au) | 1.333115 |
| a (au) | 3.461952 |
| i (deg) | 17.263589 |
| Ω (om, deg) | 35.397221 |
| ω (w, deg) | 0.378090 |
| M (ma, deg) | 322.844918 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 18:37:57.16 | -36:11:31.1 | HIP 91284 | 12.30 |
| 2026-03-26 12:00 | 18:38:19.22 | -36:13:31.9 | HIP 91470 | 12.17 |
| 2026-03-27 00:00 | 18:38:41.07 | -36:15:33.5 | HIP 91470 | 7.96 |
| 2026-03-27 12:00 | 18:39:02.72 | -36:17:35.9 | HIP 91470 | 5.11 |
| 2026-03-28 00:00 | 18:39:24.17 | -36:19:39.0 | HIP 91470 | 5.95 |
| 2026-03-28 12:00 | 18:39:45.40 | -36:21:42.8 | HIP 91470 | 9.50 |
| 2026-03-29 00:00 | 18:40:06.43 | -36:23:47.5 | HIP 91470 | 13.77 |
| 2026-03-29 12:00 | 18:40:27.25 | -36:25:52.9 | HIP 91639 | 12.44 |
| 2026-03-30 00:00 | 18:40:47.85 | -36:27:59.1 | HIP 91639 | 11.14 |
| 2026-03-30 12:00 | 18:41:08.24 | -36:30:06.1 | HIP 91639 | 11.72 |
| 2026-03-31 00:00 | 18:41:28.41 | -36:32:13.9 | HIP 91719 | 10.56 |
| 2026-03-31 12:00 | 18:41:48.36 | -36:34:22.5 | HIP 91719 | 9.24 |
| 2026-04-01 00:00 | 18:42:08.10 | -36:36:31.9 | HIP 91719 | 10.05 |
| 2026-04-01 12:00 | 18:42:27.61 | -36:38:42.2 | HIP 91719 | 12.55 |
| 2026-04-02 00:00 | 18:42:46.89 | -36:40:53.2 | HIP 91719 | 15.93 |
| 2026-04-02 12:00 | 18:43:05.95 | -36:43:05.2 | HIP 91901 | 12.42 |
| 2026-04-03 00:00 | 18:43:24.78 | -36:45:17.9 | HIP 91901 | 8.92 |
| 2026-04-03 12:00 | 18:43:43.37 | -36:47:31.5 | HIP 91901 | 6.62 |
| 2026-04-04 00:00 | 18:44:01.74 | -36:49:46.0 | HIP 91901 | 6.79 |
| 2026-04-04 12:00 | 18:44:19.87 | -36:52:01.3 | HIP 91959 | 4.32 |
| 2026-04-05 00:00 | 18:44:37.76 | -36:54:17.5 | HIP 91959 | 1.18 |
| 2026-04-05 12:00 | 18:44:55.41 | -36:56:34.6 | HIP 91959 | 4.45 |
| 2026-04-06 00:00 | 18:45:12.82 | -36:58:52.5 | HIP 91959 | 8.55 |
| 2026-04-06 12:00 | 18:45:29.98 | -37:01:11.4 | HIP 91959 | 12.67 |
| 2026-04-07 00:00 | 18:45:46.90 | -37:03:31.1 | HIP 92173 | 16.69 |
| 2026-04-07 12:00 | 18:46:03.56 | -37:05:51.7 | HIP 92173 | 13.99 |
| 2026-04-08 00:00 | 18:46:19.98 | -37:08:13.3 | HIP 92173 | 12.15 |
| 2026-04-08 12:00 | 18:46:36.14 | -37:10:35.7 | HIP 92173 | 11.53 |
| 2026-04-09 00:00 | 18:46:52.05 | -37:12:59.1 | HIP 92173 | 12.30 |
| 2026-04-09 12:00 | 18:47:07.69 | -37:15:23.4 | HIP 92173 | 14.19 |
| 2026-04-10 00:00 | 18:47:23.08 | -37:17:48.6 | HIP 92263 | 14.69 |
| 2026-04-10 12:00 | 18:47:38.20 | -37:20:14.8 | HIP 92263 | 10.89 |
| 2026-04-11 00:00 | 18:47:53.05 | -37:22:41.9 | HIP 92263 | 7.18 |
| 2026-04-11 12:00 | 18:48:07.63 | -37:25:09.9 | HIP 92263 | 3.72 |
| 2026-04-12 00:00 | 18:48:21.95 | -37:27:38.9 | HIP 92263 | 2.19 |
| 2026-04-12 12:00 | 18:48:35.99 | -37:30:08.8 | HIP 92263 | 4.87 |
| 2026-04-13 00:00 | 18:48:49.75 | -37:32:39.7 | HIP 92263 | 8.37 |
| 2026-04-13 12:00 | 18:49:03.23 | -37:35:11.5 | HIP 92263 | 11.95 |
| 2026-04-14 00:00 | 18:49:16.43 | -37:37:44.3 | HIP 92263 | 15.54 |
| 2026-04-14 12:00 | 18:49:29.35 | -37:40:18.1 | HIP 92244 | 18.59 |
| 2026-04-15 00:00 | 18:49:41.98 | -37:42:52.8 | HIP 92244 | 20.68 |
| 2026-04-15 12:00 | 18:49:54.32 | -37:45:28.5 | HIP 92244 | 23.09 |
| 2026-04-16 00:00 | 18:50:06.37 | -37:48:05.1 | HIP 92495 | 20.19 |