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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 19:20:07.28 | +51:23:04.9 | HIP 94814 | 24.16 |
| 2026-05-12 12:00 | 19:20:05.22 | +51:23:35.2 | HIP 94814 | 23.89 |
| 2026-05-13 00:00 | 19:20:03.14 | +51:24:05.4 | HIP 94814 | 23.63 |
| 2026-05-13 12:00 | 19:20:01.03 | +51:24:35.4 | HIP 94814 | 23.38 |
| 2026-05-14 00:00 | 19:19:58.89 | +51:25:05.3 | HIP 94814 | 23.13 |
| 2026-05-14 12:00 | 19:19:56.71 | +51:25:34.9 | HIP 94814 | 22.90 |
| 2026-05-15 00:00 | 19:19:54.51 | +51:26:04.3 | HIP 94814 | 22.67 |
| 2026-05-15 12:00 | 19:19:52.29 | +51:26:33.6 | HIP 94814 | 22.45 |
| 2026-05-16 00:00 | 19:19:50.03 | +51:27:02.7 | HIP 94814 | 22.24 |
| 2026-05-16 12:00 | 19:19:47.74 | +51:27:31.5 | HIP 94814 | 22.04 |
| 2026-05-17 00:00 | 19:19:45.43 | +51:28:00.2 | HIP 94814 | 21.85 |
| 2026-05-17 12:00 | 19:19:43.09 | +51:28:28.7 | HIP 94814 | 21.66 |
| 2026-05-18 00:00 | 19:19:40.72 | +51:28:57.0 | HIP 94814 | 21.49 |
| 2026-05-18 12:00 | 19:19:38.32 | +51:29:25.0 | HIP 94814 | 21.33 |
| 2026-05-19 00:00 | 19:19:35.90 | +51:29:52.9 | HIP 94814 | 21.18 |
| 2026-05-19 12:00 | 19:19:33.45 | +51:30:20.6 | HIP 94814 | 21.04 |
| 2026-05-20 00:00 | 19:19:30.97 | +51:30:48.0 | HIP 94814 | 20.91 |
| 2026-05-20 12:00 | 19:19:28.46 | +51:31:15.3 | HIP 94814 | 20.79 |
| 2026-05-21 00:00 | 19:19:25.93 | +51:31:42.3 | HIP 94814 | 20.68 |
| 2026-05-21 12:00 | 19:19:23.37 | +51:32:09.1 | HIP 94814 | 20.59 |
| 2026-05-22 00:00 | 19:19:20.78 | +51:32:35.7 | HIP 94814 | 20.50 |
| 2026-05-22 12:00 | 19:19:18.17 | +51:33:02.0 | HIP 94814 | 20.43 |
| 2026-05-23 00:00 | 19:19:15.54 | +51:33:28.2 | HIP 94814 | 20.37 |
| 2026-05-23 12:00 | 19:19:12.88 | +51:33:54.1 | HIP 94814 | 20.32 |
| 2026-05-24 00:00 | 19:19:10.19 | +51:34:19.8 | HIP 94814 | 20.29 |
| 2026-05-24 12:00 | 19:19:07.48 | +51:34:45.3 | HIP 94814 | 20.26 |
| 2026-05-25 00:00 | 19:19:04.74 | +51:35:10.5 | HIP 94814 | 20.25 |
| 2026-05-25 12:00 | 19:19:01.98 | +51:35:35.5 | HIP 94814 | 20.26 |
| 2026-05-26 00:00 | 19:18:59.19 | +51:36:00.3 | HIP 94814 | 20.27 |
| 2026-05-26 12:00 | 19:18:56.38 | +51:36:24.9 | HIP 94814 | 20.30 |
| 2026-05-27 00:00 | 19:18:53.54 | +51:36:49.2 | HIP 94814 | 20.33 |
| 2026-05-27 12:00 | 19:18:50.69 | +51:37:13.3 | HIP 94814 | 20.39 |
| 2026-05-28 00:00 | 19:18:47.80 | +51:37:37.1 | HIP 94814 | 20.45 |
| 2026-05-28 12:00 | 19:18:44.90 | +51:38:00.7 | HIP 94814 | 20.52 |
| 2026-05-29 00:00 | 19:18:41.97 | +51:38:24.1 | HIP 94814 | 20.61 |
| 2026-05-29 12:00 | 19:18:39.02 | +51:38:47.2 | HIP 94814 | 20.71 |
| 2026-05-30 00:00 | 19:18:36.04 | +51:39:10.1 | HIP 94814 | 20.82 |
| 2026-05-30 12:00 | 19:18:33.05 | +51:39:32.7 | HIP 94814 | 20.94 |
| 2026-05-31 00:00 | 19:18:30.03 | +51:39:55.1 | HIP 94814 | 21.07 |
| 2026-05-31 12:00 | 19:18:26.98 | +51:40:17.2 | HIP 94814 | 21.22 |
| 2026-06-01 00:00 | 19:18:23.92 | +51:40:39.1 | HIP 94814 | 21.37 |
| 2026-06-01 12:00 | 19:18:20.84 | +51:41:00.7 | HIP 94814 | 21.54 |
| 2026-06-02 00:00 | 19:18:17.73 | +51:41:22.1 | HIP 94814 | 21.71 |