C/2000 WM1 (LINEAR)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2000 WM1 (LINEAR) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2002-01-22T16:09:23.857920Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:08Z |
| Obs used | 2130 |
| NEO | - |
| M1 | 11.200 |
| K1 | 4.750 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2002-01-24.0000000 |
| e | 1.00024278 |
| q (au) | 0.555348 |
| a (au) | -2287.433616 |
| i (deg) | 72.550229 |
| Ω (om, deg) | 237.895729 |
| ω (w, deg) | 276.770906 |
| M (ma, deg) | 0.000012 |
Magnitude
Scatter + Global Linear
$$ M_a = (7.292 + 4.602\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 7.292 |
| n | 4.602 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2000-12-22 | 2002-01-22 | -2.0781 | +0.678 |
| 2002-01-22 | 2002-02-04 | -39.9944 | -10.010 |
| 2002-02-04 | 2002-05-18 | +3.0549 | -0.945 |
| 2002-05-18 | 2003-06-05 | +0.1428 | +0.246 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 19:20:56.08 | +50:27:58.7 | HIP 95062 | 8.53 |
| 2026-03-26 12:00 | 19:20:57.12 | +50:28:34.9 | HIP 95062 | 9.14 |
| 2026-03-27 00:00 | 19:20:58.12 | +50:29:11.1 | HIP 95062 | 9.75 |
| 2026-03-27 12:00 | 19:20:59.08 | +50:29:47.4 | HIP 95062 | 10.36 |
| 2026-03-28 00:00 | 19:21:00.02 | +50:30:23.8 | HIP 95062 | 10.98 |
| 2026-03-28 12:00 | 19:21:00.92 | +50:31:00.2 | HIP 95062 | 11.59 |
| 2026-03-29 00:00 | 19:21:01.78 | +50:31:36.6 | HIP 95062 | 12.20 |
| 2026-03-29 12:00 | 19:21:02.62 | +50:32:13.1 | HIP 95062 | 12.81 |
| 2026-03-30 00:00 | 19:21:03.42 | +50:32:49.6 | HIP 95062 | 13.42 |
| 2026-03-30 12:00 | 19:21:04.19 | +50:33:26.1 | HIP 95062 | 14.03 |
| 2026-03-31 00:00 | 19:21:04.93 | +50:34:02.7 | HIP 95062 | 14.64 |
| 2026-03-31 12:00 | 19:21:05.63 | +50:34:39.4 | HIP 94994 | 14.51 |
| 2026-04-01 00:00 | 19:21:06.30 | +50:35:16.0 | HIP 94994 | 14.29 |
| 2026-04-01 12:00 | 19:21:06.93 | +50:35:52.7 | HIP 94994 | 14.10 |
| 2026-04-02 00:00 | 19:21:07.54 | +50:36:29.4 | HIP 94994 | 13.93 |
| 2026-04-02 12:00 | 19:21:08.11 | +50:37:06.2 | HIP 94994 | 13.77 |
| 2026-04-03 00:00 | 19:21:08.64 | +50:37:42.9 | HIP 94994 | 13.64 |
| 2026-04-03 12:00 | 19:21:09.15 | +50:38:19.7 | HIP 94994 | 13.53 |
| 2026-04-04 00:00 | 19:21:09.61 | +50:38:56.5 | HIP 94994 | 13.44 |
| 2026-04-04 12:00 | 19:21:10.05 | +50:39:33.3 | HIP 94994 | 13.38 |
| 2026-04-05 00:00 | 19:21:10.45 | +50:40:10.2 | HIP 94994 | 13.34 |
| 2026-04-05 12:00 | 19:21:10.82 | +50:40:47.0 | HIP 94994 | 13.32 |
| 2026-04-06 00:00 | 19:21:11.16 | +50:41:23.9 | HIP 94994 | 13.32 |
| 2026-04-06 12:00 | 19:21:11.46 | +50:42:00.7 | HIP 94994 | 13.35 |
| 2026-04-07 00:00 | 19:21:11.72 | +50:42:37.6 | HIP 94994 | 13.40 |
| 2026-04-07 12:00 | 19:21:11.96 | +50:43:14.4 | HIP 94994 | 13.47 |
| 2026-04-08 00:00 | 19:21:12.16 | +50:43:51.3 | HIP 94994 | 13.57 |
| 2026-04-08 12:00 | 19:21:12.32 | +50:44:28.1 | HIP 94994 | 13.69 |
| 2026-04-09 00:00 | 19:21:12.45 | +50:45:04.9 | HIP 94994 | 13.82 |
| 2026-04-09 12:00 | 19:21:12.55 | +50:45:41.8 | HIP 94994 | 13.98 |
| 2026-04-10 00:00 | 19:21:12.62 | +50:46:18.6 | HIP 94994 | 14.16 |
| 2026-04-10 12:00 | 19:21:12.65 | +50:46:55.4 | HIP 94994 | 14.36 |
| 2026-04-11 00:00 | 19:21:12.64 | +50:47:32.1 | HIP 94994 | 14.57 |
| 2026-04-11 12:00 | 19:21:12.60 | +50:48:08.9 | HIP 94994 | 14.80 |
| 2026-04-12 00:00 | 19:21:12.53 | +50:48:45.6 | HIP 94994 | 15.05 |
| 2026-04-12 12:00 | 19:21:12.43 | +50:49:22.3 | HIP 94994 | 15.32 |
| 2026-04-13 00:00 | 19:21:12.29 | +50:49:59.0 | HIP 94994 | 15.59 |
| 2026-04-13 12:00 | 19:21:12.11 | +50:50:35.6 | HIP 94994 | 15.89 |
| 2026-04-14 00:00 | 19:21:11.90 | +50:51:12.3 | HIP 94994 | 16.19 |
| 2026-04-14 12:00 | 19:21:11.66 | +50:51:48.8 | HIP 94994 | 16.51 |
| 2026-04-15 00:00 | 19:21:11.38 | +50:52:25.4 | HIP 94994 | 16.84 |
| 2026-04-15 12:00 | 19:21:11.07 | +50:53:01.8 | HIP 94994 | 17.18 |
| 2026-04-16 00:00 | 19:21:10.73 | +50:53:38.3 | HIP 94994 | 17.53 |