49P/Arend-Rigaux
Metadata
| Parameter | Value |
|---|---|
| Designation | 49P/Arend-Rigaux |
| Type | P |
| Perihelion (tp_cal, UTC) | 2011-10-19T07:03:42.491520Z |
| Orbit solution date (soln_date, UTC) | 2026-05-28T12:52:06Z |
| Obs used | 4468 |
| NEO | - |
| M1 | 13.900 |
| K1 | 6.500 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-01-16.0000000 |
| e | 0.60018137 |
| q (au) | 1.426078 |
| a (au) | 3.566812 |
| i (deg) | 19.056573 |
| Ω (om, deg) | 118.831192 |
| ω (w, deg) | 332.926340 |
| M (ma, deg) | 173.338196 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.888 + 5.474\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.888 |
| n | 5.474 |
| gf | 0.983 |
| gb | -0.920 |
| k | 0.986 |
| 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 |
|---|---|---|---|
| 2023-05-02 | 2024-11-21 | +7.2269 | -1.762 |
| 2024-11-21 | 2024-08-28 | -0.4935 | +0.400 |
| 2024-08-28 | 2023-10-24 | -10.9208 | +4.536 |
| 2023-10-24 | 2026-03-18 | +46.5140 | -31.880 |
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 | 14:36:48.25 | +09:48:39.0 | HIP 71395 | 12.38 |
| 2026-06-01 12:00 | 14:36:31.32 | +09:47:17.7 | HIP 71395 | 8.00 |
| 2026-06-02 00:00 | 14:36:14.63 | +09:45:54.3 | HIP 71395 | 3.66 |
| 2026-06-02 12:00 | 14:35:58.17 | +09:44:28.8 | HIP 71395 | 0.66 |
| 2026-06-03 00:00 | 14:35:41.94 | +09:43:01.2 | HIP 71395 | 4.90 |
| 2026-06-03 12:00 | 14:35:25.95 | +09:41:31.4 | HIP 71395 | 9.12 |
| 2026-06-04 00:00 | 14:35:10.19 | +09:39:59.6 | HIP 71395 | 13.29 |
| 2026-06-04 12:00 | 14:34:54.67 | +09:38:25.7 | HIP 71305 | 14.76 |
| 2026-06-05 00:00 | 14:34:39.39 | +09:36:49.7 | HIP 71305 | 16.82 |
| 2026-06-05 12:00 | 14:34:24.35 | +09:35:11.7 | HIP 71190 | 19.39 |
| 2026-06-06 00:00 | 14:34:09.55 | +09:33:31.8 | HIP 71190 | 15.90 |
| 2026-06-06 12:00 | 14:33:54.99 | +09:31:49.8 | HIP 71190 | 12.71 |
| 2026-06-07 00:00 | 14:33:40.68 | +09:30:05.9 | HIP 71190 | 10.06 |
| 2026-06-07 12:00 | 14:33:26.61 | +09:28:20.0 | HIP 71190 | 8.44 |
| 2026-06-08 00:00 | 14:33:12.78 | +09:26:32.2 | HIP 71190 | 8.39 |
| 2026-06-08 12:00 | 14:32:59.21 | +09:24:42.4 | HIP 71190 | 9.90 |
| 2026-06-09 00:00 | 14:32:45.88 | +09:22:50.8 | HIP 71190 | 12.37 |
| 2026-06-09 12:00 | 14:32:32.80 | +09:20:57.3 | HIP 71190 | 15.32 |
| 2026-06-10 00:00 | 14:32:19.96 | +09:19:02.0 | HIP 71190 | 18.50 |
| 2026-06-10 12:00 | 14:32:07.38 | +09:17:04.8 | HIP 71190 | 21.78 |
| 2026-06-11 00:00 | 14:31:55.05 | +09:15:05.8 | HIP 70928 | 23.68 |
| 2026-06-11 12:00 | 14:31:42.98 | +09:13:05.1 | HIP 70928 | 20.82 |
| 2026-06-12 00:00 | 14:31:31.15 | +09:11:02.5 | HIP 70928 | 18.29 |
| 2026-06-12 12:00 | 14:31:19.58 | +09:08:58.2 | HIP 70928 | 16.22 |
| 2026-06-13 00:00 | 14:31:08.26 | +09:06:52.2 | HIP 70928 | 14.79 |
| 2026-06-13 12:00 | 14:30:57.20 | +09:04:44.4 | HIP 70928 | 14.16 |
| 2026-06-14 00:00 | 14:30:46.40 | +09:02:34.9 | HIP 70928 | 14.41 |
| 2026-06-14 12:00 | 14:30:35.85 | +09:00:23.8 | HIP 70928 | 15.48 |
| 2026-06-15 00:00 | 14:30:25.55 | +08:58:11.0 | HIP 70928 | 17.21 |
| 2026-06-15 12:00 | 14:30:15.52 | +08:55:56.6 | HIP 70831 | 18.55 |
| 2026-06-16 00:00 | 14:30:05.74 | +08:53:40.6 | HIP 70831 | 17.41 |
| 2026-06-16 12:00 | 14:29:56.22 | +08:51:23.0 | HIP 70831 | 16.92 |
| 2026-06-17 00:00 | 14:29:46.95 | +08:49:03.9 | HIP 70831 | 17.12 |
| 2026-06-17 12:00 | 14:29:37.95 | +08:46:43.2 | HIP 70831 | 17.96 |
| 2026-06-18 00:00 | 14:29:29.20 | +08:44:20.9 | HIP 70831 | 19.37 |
| 2026-06-18 12:00 | 14:29:20.72 | +08:41:57.2 | HIP 70831 | 21.20 |
| 2026-06-19 00:00 | 14:29:12.49 | +08:39:32.0 | HIP 70914 | 22.97 |
| 2026-06-19 12:00 | 14:29:04.51 | +08:37:05.4 | HIP 70914 | 22.41 |
| 2026-06-20 00:00 | 14:28:56.80 | +08:34:37.3 | HIP 70914 | 22.22 |
| 2026-06-20 12:00 | 14:28:49.34 | +08:32:07.8 | HIP 70914 | 22.40 |
| 2026-06-21 00:00 | 14:28:42.14 | +08:29:37.0 | HIP 70914 | 22.94 |
| 2026-06-21 12:00 | 14:28:35.20 | +08:27:04.7 | HIP 70914 | 23.79 |
| 2026-06-22 00:00 | 14:28:28.51 | +08:24:31.2 | HIP 70914 | 24.93 |