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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 18:42:42.62 | -42:41:41.3 | HIP 91654 | 15.22 |
| 2026-06-01 12:00 | 18:42:18.44 | -42:45:00.0 | HIP 91654 | 13.25 |
| 2026-06-02 00:00 | 18:41:53.83 | -42:48:17.7 | HIP 91654 | 13.40 |
| 2026-06-02 12:00 | 18:41:28.80 | -42:51:34.6 | HIP 91654 | 15.68 |
| 2026-06-03 00:00 | 18:41:03.34 | -42:54:50.4 | HIP 91654 | 19.39 |
| 2026-06-03 12:00 | 18:40:37.47 | -42:58:05.3 | HIP 91494 | 17.32 |
| 2026-06-04 00:00 | 18:40:11.17 | -43:01:19.2 | HIP 91494 | 11.82 |
| 2026-06-04 12:00 | 18:39:44.46 | -43:04:31.9 | HIP 91494 | 6.83 |
| 2026-06-05 00:00 | 18:39:17.33 | -43:07:43.5 | HIP 91494 | 4.72 |
| 2026-06-05 12:00 | 18:38:49.79 | -43:10:53.8 | HIP 91494 | 8.28 |
| 2026-06-06 00:00 | 18:38:21.84 | -43:14:03.0 | HIP 91494 | 13.68 |
| 2026-06-06 12:00 | 18:37:53.48 | -43:17:10.8 | HIP 91309 | 12.57 |
| 2026-06-07 00:00 | 18:37:24.73 | -43:20:17.3 | HIP 91309 | 8.80 |
| 2026-06-07 12:00 | 18:36:55.57 | -43:23:22.4 | HIP 91309 | 8.49 |
| 2026-06-08 00:00 | 18:36:26.02 | -43:26:26.1 | HIP 91309 | 11.97 |
| 2026-06-08 12:00 | 18:35:56.07 | -43:29:28.3 | HIP 91309 | 17.12 |
| 2026-06-09 00:00 | 18:35:25.74 | -43:32:28.9 | HIP 91309 | 22.86 |
| 2026-06-09 12:00 | 18:34:55.02 | -43:35:28.0 | HIP 91309 | 28.89 |
| 2026-06-10 00:00 | 18:34:23.92 | -43:38:25.4 | HIP 90842 | 27.92 |
| 2026-06-10 12:00 | 18:33:52.44 | -43:41:21.1 | HIP 90842 | 23.70 |
| 2026-06-11 00:00 | 18:33:20.60 | -43:44:15.1 | HIP 90842 | 20.59 |
| 2026-06-11 12:00 | 18:32:48.39 | -43:47:07.3 | HIP 90782 | 16.96 |
| 2026-06-12 00:00 | 18:32:15.81 | -43:49:57.7 | HIP 90782 | 10.72 |
| 2026-06-12 12:00 | 18:31:42.89 | -43:52:46.2 | HIP 90782 | 5.17 |
| 2026-06-13 00:00 | 18:31:09.61 | -43:55:32.7 | HIP 90782 | 4.97 |
| 2026-06-13 12:00 | 18:30:35.99 | -43:58:17.2 | HIP 90674 | 10.04 |
| 2026-06-14 00:00 | 18:30:02.03 | -44:00:59.8 | HIP 90674 | 10.99 |
| 2026-06-14 12:00 | 18:29:27.74 | -44:03:40.2 | HIP 90563 | 7.55 |
| 2026-06-15 00:00 | 18:28:53.13 | -44:06:18.5 | HIP 90563 | 1.52 |
| 2026-06-15 12:00 | 18:28:18.20 | -44:08:54.6 | HIP 90563 | 6.26 |
| 2026-06-16 00:00 | 18:27:42.96 | -44:11:28.5 | HIP 90563 | 13.00 |
| 2026-06-16 12:00 | 18:27:07.42 | -44:14:00.2 | HIP 90323 | 16.55 |
| 2026-06-17 00:00 | 18:26:31.58 | -44:16:29.5 | HIP 90323 | 13.09 |
| 2026-06-17 12:00 | 18:25:55.46 | -44:18:56.5 | HIP 90323 | 12.75 |
| 2026-06-18 00:00 | 18:25:19.05 | -44:21:21.0 | HIP 90323 | 15.78 |
| 2026-06-18 12:00 | 18:24:42.37 | -44:23:43.1 | HIP 90200 | 17.64 |
| 2026-06-19 00:00 | 18:24:05.43 | -44:26:02.8 | HIP 90200 | 19.57 |
| 2026-06-19 12:00 | 18:23:28.23 | -44:28:19.9 | HIP 90200 | 23.49 |
| 2026-06-20 00:00 | 18:22:50.78 | -44:30:34.4 | HIP 90200 | 28.62 |
| 2026-06-20 12:00 | 18:22:13.10 | -44:32:46.4 | HIP 90157 | 31.16 |
| 2026-06-21 00:00 | 18:21:35.18 | -44:34:55.7 | HIP 89887 | 32.58 |
| 2026-06-21 12:00 | 18:20:57.04 | -44:37:02.3 | HIP 89887 | 32.83 |
| 2026-06-22 00:00 | 18:20:18.68 | -44:39:06.2 | HIP 89701 | 26.92 |