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
$$ M_a = (11.917 + 3.079\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.917 |
| n | 3.079 |
| gf | 1.000 |
| gb | -0.998 |
| 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 |
|---|---|---|---|
| 2020-06-27 | 2020-09-16 | -0.0282 | +3.528 |
| 2020-09-16 | 2020-11-17 | +72.8742 | -9.480 |
| 2020-11-17 | 2021-03-31 | -0.7487 | -0.622 |
| 2021-03-31 | 2022-03-31 | +7.9602 | -3.468 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 17:47:39.90 | -33:28:33.4 | HIP 87221 | 23.35 |
| 2026-02-03 12:00 | 17:48:14.44 | -33:29:56.7 | HIP 87221 | 19.04 |
| 2026-02-04 00:00 | 17:48:48.91 | -33:31:20.1 | HIP 87221 | 16.96 |
| 2026-02-04 12:00 | 17:49:23.33 | -33:32:43.5 | HIP 87221 | 17.90 |
| 2026-02-05 00:00 | 17:49:57.69 | -33:34:07.0 | HIP 87345 | 14.04 |
| 2026-02-05 12:00 | 17:50:32.00 | -33:35:30.5 | HIP 87345 | 8.04 |
| 2026-02-06 00:00 | 17:51:06.24 | -33:36:54.2 | HIP 87345 | 6.16 |
| 2026-02-06 12:00 | 17:51:40.41 | -33:38:17.9 | HIP 87345 | 10.79 |
| 2026-02-07 00:00 | 17:52:14.53 | -33:39:41.6 | HIP 87345 | 17.30 |
| 2026-02-07 12:00 | 17:52:48.58 | -33:41:05.5 | HIP 87664 | 20.29 |
| 2026-02-08 00:00 | 17:53:22.56 | -33:42:29.5 | HIP 87664 | 13.90 |
| 2026-02-08 12:00 | 17:53:56.48 | -33:43:53.5 | HIP 87664 | 8.90 |
| 2026-02-09 00:00 | 17:54:30.33 | -33:45:17.7 | HIP 87664 | 8.29 |
| 2026-02-09 12:00 | 17:55:04.11 | -33:46:41.9 | HIP 87686 | 11.95 |
| 2026-02-10 00:00 | 17:55:37.83 | -33:48:06.3 | HIP 87791 | 11.51 |
| 2026-02-10 12:00 | 17:56:11.47 | -33:49:30.8 | HIP 87791 | 12.02 |
| 2026-02-11 00:00 | 17:56:45.03 | -33:50:55.4 | HIP 87791 | 16.07 |
| 2026-02-11 12:00 | 17:57:18.53 | -33:52:20.2 | HIP 87791 | 21.74 |
| 2026-02-12 00:00 | 17:57:51.94 | -33:53:45.0 | HIP 87885 | 23.00 |
| 2026-02-12 12:00 | 17:58:25.29 | -33:55:10.0 | HIP 87885 | 25.26 |
| 2026-02-13 00:00 | 17:58:58.55 | -33:56:35.2 | HIP 88182 | 19.61 |
| 2026-02-13 12:00 | 17:59:31.73 | -33:58:00.5 | HIP 88182 | 13.02 |
| 2026-02-14 00:00 | 18:00:04.84 | -33:59:26.0 | HIP 88182 | 7.33 |
| 2026-02-14 12:00 | 18:00:37.86 | -34:00:51.6 | HIP 88182 | 6.02 |
| 2026-02-15 00:00 | 18:01:10.80 | -34:02:17.4 | HIP 88182 | 10.79 |
| 2026-02-15 12:00 | 18:01:43.66 | -34:03:43.3 | HIP 88299 | 5.05 |
| 2026-02-16 00:00 | 18:02:16.43 | -34:05:09.5 | HIP 88299 | 5.32 |
| 2026-02-16 12:00 | 18:02:49.11 | -34:06:35.8 | HIP 88299 | 11.26 |
| 2026-02-17 00:00 | 18:03:21.71 | -34:08:02.3 | HIP 88492 | 10.96 |
| 2026-02-17 12:00 | 18:03:54.21 | -34:09:29.0 | HIP 88492 | 7.02 |
| 2026-02-18 00:00 | 18:04:26.63 | -34:10:56.0 | HIP 88492 | 8.55 |
| 2026-02-18 12:00 | 18:04:58.95 | -34:12:23.1 | HIP 88492 | 13.81 |
| 2026-02-19 00:00 | 18:05:31.18 | -34:13:50.4 | HIP 88691 | 11.42 |
| 2026-02-19 12:00 | 18:06:03.32 | -34:15:18.0 | HIP 88691 | 5.09 |
| 2026-02-20 00:00 | 18:06:35.35 | -34:16:45.8 | HIP 88691 | 3.71 |
| 2026-02-20 12:00 | 18:07:07.30 | -34:18:13.8 | HIP 88691 | 9.65 |
| 2026-02-21 00:00 | 18:07:39.14 | -34:19:42.1 | HIP 88800 | 11.72 |
| 2026-02-21 12:00 | 18:08:10.88 | -34:21:10.6 | HIP 88800 | 14.83 |
| 2026-02-22 00:00 | 18:08:42.52 | -34:22:39.4 | HIP 88800 | 19.82 |
| 2026-02-22 12:00 | 18:09:14.06 | -34:24:08.4 | HIP 88971 | 20.37 |
| 2026-02-23 00:00 | 18:09:45.50 | -34:25:37.7 | HIP 88971 | 21.33 |
| 2026-02-23 12:00 | 18:10:16.83 | -34:27:07.2 | HIP 88971 | 24.16 |
| 2026-02-24 00:00 | 18:10:48.06 | -34:28:37.1 | HIP 89007 | 25.66 |