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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 19:18:14.60 | +51:41:43.2 | HIP 94814 | 21.90 |
| 2026-06-03 00:00 | 19:18:11.45 | +51:42:04.1 | HIP 94814 | 22.10 |
| 2026-06-03 12:00 | 19:18:08.28 | +51:42:24.7 | HIP 94814 | 22.30 |
| 2026-06-04 00:00 | 19:18:05.09 | +51:42:45.0 | HIP 94814 | 22.52 |
| 2026-06-04 12:00 | 19:18:01.88 | +51:43:05.1 | HIP 94814 | 22.74 |
| 2026-06-05 00:00 | 19:17:58.65 | +51:43:24.9 | HIP 94814 | 22.97 |
| 2026-06-05 12:00 | 19:17:55.40 | +51:43:44.5 | HIP 94814 | 23.21 |
| 2026-06-06 00:00 | 19:17:52.13 | +51:44:03.8 | HIP 94814 | 23.46 |
| 2026-06-06 12:00 | 19:17:48.84 | +51:44:22.8 | HIP 94721 | 23.54 |
| 2026-06-07 00:00 | 19:17:45.54 | +51:44:41.6 | HIP 94721 | 23.53 |
| 2026-06-07 12:00 | 19:17:42.21 | +51:45:00.1 | HIP 94721 | 23.54 |
| 2026-06-08 00:00 | 19:17:38.86 | +51:45:18.3 | HIP 94721 | 23.55 |
| 2026-06-08 12:00 | 19:17:35.50 | +51:45:36.2 | HIP 94721 | 23.57 |
| 2026-06-09 00:00 | 19:17:32.11 | +51:45:53.9 | HIP 94721 | 23.60 |
| 2026-06-09 12:00 | 19:17:28.71 | +51:46:11.3 | HIP 94721 | 23.65 |
| 2026-06-10 00:00 | 19:17:25.30 | +51:46:28.4 | HIP 94721 | 23.70 |
| 2026-06-10 12:00 | 19:17:21.86 | +51:46:45.3 | HIP 94721 | 23.76 |
| 2026-06-11 00:00 | 19:17:18.41 | +51:47:01.8 | HIP 94721 | 23.84 |
| 2026-06-11 12:00 | 19:17:14.94 | +51:47:18.1 | HIP 94721 | 23.92 |
| 2026-06-12 00:00 | 19:17:11.45 | +51:47:34.1 | HIP 94721 | 24.01 |
| 2026-06-12 12:00 | 19:17:07.95 | +51:47:49.8 | HIP 94721 | 24.11 |
| 2026-06-13 00:00 | 19:17:04.43 | +51:48:05.2 | HIP 94721 | 24.22 |
| 2026-06-13 12:00 | 19:17:00.89 | +51:48:20.4 | HIP 94721 | 24.34 |
| 2026-06-14 00:00 | 19:16:57.34 | +51:48:35.2 | HIP 94721 | 24.47 |
| 2026-06-14 12:00 | 19:16:53.78 | +51:48:49.8 | HIP 94721 | 24.61 |
| 2026-06-15 00:00 | 19:16:50.20 | +51:49:04.1 | HIP 94721 | 24.76 |
| 2026-06-15 12:00 | 19:16:46.60 | +51:49:18.1 | HIP 94721 | 24.92 |
| 2026-06-16 00:00 | 19:16:42.99 | +51:49:31.7 | HIP 94721 | 25.08 |
| 2026-06-16 12:00 | 19:16:39.37 | +51:49:45.1 | HIP 94721 | 25.25 |
| 2026-06-17 00:00 | 19:16:35.73 | +51:49:58.2 | HIP 94721 | 25.44 |
| 2026-06-17 12:00 | 19:16:32.08 | +51:50:11.0 | HIP 94721 | 25.62 |
| 2026-06-18 00:00 | 19:16:28.41 | +51:50:23.5 | HIP 94721 | 25.82 |
| 2026-06-18 12:00 | 19:16:24.74 | +51:50:35.8 | HIP 94721 | 26.03 |
| 2026-06-19 00:00 | 19:16:21.05 | +51:50:47.7 | HIP 94721 | 26.24 |
| 2026-06-19 12:00 | 19:16:17.35 | +51:50:59.3 | HIP 94721 | 26.46 |
| 2026-06-20 00:00 | 19:16:13.63 | +51:51:10.6 | HIP 94721 | 26.69 |
| 2026-06-20 12:00 | 19:16:09.91 | +51:51:21.6 | HIP 94721 | 26.92 |
| 2026-06-21 00:00 | 19:16:06.17 | +51:51:32.3 | HIP 94721 | 27.16 |
| 2026-06-21 12:00 | 19:16:02.43 | +51:51:42.7 | HIP 94721 | 27.41 |
| 2026-06-22 00:00 | 19:15:58.67 | +51:51:52.8 | HIP 94721 | 27.66 |