49P/Arend-Rigaux
Metadata
| Parameter | Value |
|---|---|
| Designation | 49P/Arend-Rigaux |
| Type | P |
| Perihelion (tp_cal, UTC) | 2011-10-19T07:01:58.301760Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T13:32:18Z |
| Obs used | 4396 |
| NEO | - |
| M1 | 13.800 |
| K1 | 6.750 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2014-11-09.0000000 |
| e | 0.60022691 |
| q (au) | 1.425869 |
| a (au) | 3.566695 |
| i (deg) | 19.056417 |
| Ω (om, deg) | 118.831445 |
| ω (w, deg) | 332.923069 |
| M (ma, deg) | 163.397123 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.662 + 5.915\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.662 |
| n | 5.915 |
| gf | 0.800 |
| gb | -0.931 |
| k | 0.983 |
| 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 | +6.1030 | -1.494 |
| 2024-11-21 | 2024-08-28 | +0.0271 | +0.153 |
| 2024-08-28 | 2023-10-24 | -11.9454 | +4.908 |
| 2023-10-24 | 2025-12-31 | +50.4906 | -34.677 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 15:25:25.45 | +06:50:21.2 | HIP 75566 | 14.81 |
| 2026-03-26 12:00 | 15:25:11.93 | +06:53:37.7 | HIP 75566 | 19.45 |
| 2026-03-27 00:00 | 15:24:58.12 | +06:56:53.8 | HIP 75566 | 24.15 |
| 2026-03-27 12:00 | 15:24:44.01 | +07:00:09.3 | HIP 75318 | 21.81 |
| 2026-03-28 00:00 | 15:24:29.61 | +07:03:24.3 | HIP 75318 | 18.09 |
| 2026-03-28 12:00 | 15:24:14.93 | +07:06:38.8 | HIP 75318 | 14.94 |
| 2026-03-29 00:00 | 15:23:59.96 | +07:09:52.6 | HIP 75318 | 12.86 |
| 2026-03-29 12:00 | 15:23:44.71 | +07:13:05.9 | HIP 75318 | 12.44 |
| 2026-03-30 00:00 | 15:23:29.18 | +07:16:18.4 | HIP 75318 | 13.88 |
| 2026-03-30 12:00 | 15:23:13.38 | +07:19:30.3 | HIP 75318 | 16.75 |
| 2026-03-31 00:00 | 15:22:57.29 | +07:22:41.4 | HIP 75328 | 17.75 |
| 2026-03-31 12:00 | 15:22:40.94 | +07:25:51.7 | HIP 75328 | 17.36 |
| 2026-04-01 00:00 | 15:22:24.32 | +07:29:01.2 | HIP 75328 | 18.51 |
| 2026-04-01 12:00 | 15:22:07.43 | +07:32:09.8 | HIP 75226 | 17.17 |
| 2026-04-02 00:00 | 15:21:50.28 | +07:35:17.6 | HIP 75106 | 15.52 |
| 2026-04-02 12:00 | 15:21:32.87 | +07:38:24.5 | HIP 75106 | 10.45 |
| 2026-04-03 00:00 | 15:21:15.20 | +07:41:30.4 | HIP 75106 | 5.78 |
| 2026-04-03 12:00 | 15:20:57.28 | +07:44:35.3 | HIP 75106 | 3.85 |
| 2026-04-04 00:00 | 15:20:39.11 | +07:47:39.2 | HIP 75106 | 7.41 |
| 2026-04-04 12:00 | 15:20:20.69 | +07:50:42.0 | HIP 75106 | 12.44 |
| 2026-04-05 00:00 | 15:20:02.02 | +07:53:43.8 | HIP 75106 | 17.78 |
| 2026-04-05 12:00 | 15:19:43.11 | +07:56:44.3 | HIP 75106 | 23.23 |
| 2026-04-06 00:00 | 15:19:23.97 | +07:59:43.8 | HIP 74832 | 28.03 |
| 2026-04-06 12:00 | 15:19:04.59 | +08:02:42.0 | HIP 74832 | 24.84 |
| 2026-04-07 00:00 | 15:18:44.98 | +08:05:39.0 | HIP 74832 | 22.56 |
| 2026-04-07 12:00 | 15:18:25.14 | +08:08:34.7 | HIP 74832 | 21.53 |
| 2026-04-08 00:00 | 15:18:05.08 | +08:11:29.0 | HIP 74832 | 21.95 |
| 2026-04-08 12:00 | 15:17:44.80 | +08:14:22.1 | HIP 74832 | 23.77 |
| 2026-04-09 00:00 | 15:17:24.30 | +08:17:13.7 | HIP 74832 | 26.73 |
| 2026-04-09 12:00 | 15:17:03.59 | +08:20:03.9 | HIP 74832 | 30.52 |
| 2026-04-10 00:00 | 15:16:42.68 | +08:22:52.7 | HIP 74632 | 28.97 |
| 2026-04-10 12:00 | 15:16:21.55 | +08:25:39.9 | HIP 74632 | 25.90 |
| 2026-04-11 00:00 | 15:16:00.23 | +08:28:25.6 | HIP 74632 | 23.87 |
| 2026-04-11 12:00 | 15:15:38.71 | +08:31:09.8 | HIP 74632 | 23.20 |
| 2026-04-12 00:00 | 15:15:17.00 | +08:33:52.4 | HIP 74632 | 24.01 |
| 2026-04-12 12:00 | 15:14:55.10 | +08:36:33.3 | HIP 74632 | 26.18 |
| 2026-04-13 00:00 | 15:14:33.01 | +08:39:12.5 | HIP 74474 | 25.22 |
| 2026-04-13 12:00 | 15:14:10.75 | +08:41:50.0 | HIP 74474 | 19.14 |
| 2026-04-14 00:00 | 15:13:48.31 | +08:44:25.8 | HIP 74474 | 13.05 |
| 2026-04-14 12:00 | 15:13:25.71 | +08:46:59.8 | HIP 74474 | 7.02 |
| 2026-04-15 00:00 | 15:13:02.93 | +08:49:32.0 | HIP 74474 | 1.97 |
| 2026-04-15 12:00 | 15:12:40.00 | +08:52:02.3 | HIP 74427 | 4.05 |
| 2026-04-16 00:00 | 15:12:16.91 | +08:54:30.8 | HIP 74427 | 6.03 |