49P/Arend-Rigaux
Metadata
| Parameter | Value |
|---|---|
| Designation | 49P/Arend-Rigaux |
| Type | P |
| Perihelion (tp_cal, UTC) | 2011-10-19T06:57:50.852160Z |
| Orbit solution date (soln_date, UTC) | 2026-05-06T05:41:03Z |
| Obs used | 4441 |
| NEO | - |
| M1 | 13.800 |
| K1 | 6.750 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2014-12-22.0000000 |
| e | 0.60019593 |
| q (au) | 1.426011 |
| a (au) | 3.566775 |
| i (deg) | 19.056487 |
| Ω (om, deg) | 118.831332 |
| ω (w, deg) | 332.925104 |
| M (ma, deg) | 169.683587 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 14:50:48.47 | +10:09:54.6 | HIP 72499 | 21.51 |
| 2026-05-12 12:00 | 14:50:24.38 | +10:10:13.3 | HIP 72499 | 16.19 |
| 2026-05-13 00:00 | 14:50:00.39 | +10:10:29.2 | HIP 72499 | 11.49 |
| 2026-05-13 12:00 | 14:49:36.52 | +10:10:42.5 | HIP 72479 | 6.02 |
| 2026-05-14 00:00 | 14:49:12.76 | +10:10:53.1 | HIP 72479 | 2.02 |
| 2026-05-14 12:00 | 14:48:49.13 | +10:11:01.0 | HIP 72479 | 6.33 |
| 2026-05-15 00:00 | 14:48:25.63 | +10:11:06.2 | HIP 72479 | 11.96 |
| 2026-05-15 12:00 | 14:48:02.26 | +10:11:08.7 | HIP 72322 | 12.20 |
| 2026-05-16 00:00 | 14:47:39.02 | +10:11:08.5 | HIP 72322 | 8.32 |
| 2026-05-16 12:00 | 14:47:15.92 | +10:11:05.7 | HIP 72322 | 7.45 |
| 2026-05-17 00:00 | 14:46:52.97 | +10:11:00.2 | HIP 72322 | 10.32 |
| 2026-05-17 12:00 | 14:46:30.17 | +10:10:52.1 | HIP 72190 | 11.28 |
| 2026-05-18 00:00 | 14:46:07.52 | +10:10:41.3 | HIP 72190 | 8.01 |
| 2026-05-18 12:00 | 14:45:45.02 | +10:10:27.9 | HIP 72190 | 7.90 |
| 2026-05-19 00:00 | 14:45:22.69 | +10:10:11.8 | HIP 72190 | 10.99 |
| 2026-05-19 12:00 | 14:45:00.51 | +10:09:53.1 | HIP 72190 | 15.42 |
| 2026-05-20 00:00 | 14:44:38.51 | +10:09:31.8 | HIP 72190 | 20.32 |
| 2026-05-20 12:00 | 14:44:16.67 | +10:09:08.0 | HIP 71962 | 18.61 |
| 2026-05-21 00:00 | 14:43:55.01 | +10:08:41.5 | HIP 71962 | 13.84 |
| 2026-05-21 12:00 | 14:43:33.53 | +10:08:12.5 | HIP 71962 | 9.75 |
| 2026-05-22 00:00 | 14:43:12.23 | +10:07:40.9 | HIP 71962 | 7.47 |
| 2026-05-22 12:00 | 14:42:51.11 | +10:07:06.8 | HIP 71962 | 8.50 |
| 2026-05-23 00:00 | 14:42:30.18 | +10:06:30.1 | HIP 71962 | 11.98 |
| 2026-05-23 12:00 | 14:42:09.44 | +10:05:51.0 | HIP 71962 | 16.37 |
| 2026-05-24 00:00 | 14:41:48.89 | +10:05:09.3 | HIP 71962 | 21.08 |
| 2026-05-24 12:00 | 14:41:28.53 | +10:04:25.2 | HIP 71714 | 22.54 |
| 2026-05-25 00:00 | 14:41:08.38 | +10:03:38.7 | HIP 71714 | 17.97 |
| 2026-05-25 12:00 | 14:40:48.42 | +10:02:49.7 | HIP 71714 | 13.74 |
| 2026-05-26 00:00 | 14:40:28.67 | +10:01:58.3 | HIP 71714 | 10.19 |
| 2026-05-26 12:00 | 14:40:09.12 | +10:01:04.4 | HIP 71714 | 8.18 |
| 2026-05-27 00:00 | 14:39:49.78 | +10:00:08.2 | HIP 71714 | 8.77 |
| 2026-05-27 12:00 | 14:39:30.65 | +09:59:09.6 | HIP 71714 | 11.51 |
| 2026-05-28 00:00 | 14:39:11.73 | +09:58:08.7 | HIP 71579 | 13.07 |
| 2026-05-28 12:00 | 14:38:53.02 | +09:57:05.5 | HIP 71579 | 8.54 |
| 2026-05-29 00:00 | 14:38:34.53 | +09:55:59.9 | HIP 71579 | 4.52 |
| 2026-05-29 12:00 | 14:38:16.26 | +09:54:52.0 | HIP 71579 | 3.46 |
| 2026-05-30 00:00 | 14:37:58.21 | +09:53:41.9 | HIP 71579 | 6.80 |
| 2026-05-30 12:00 | 14:37:40.38 | +09:52:29.5 | HIP 71579 | 11.06 |
| 2026-05-31 00:00 | 14:37:22.78 | +09:51:14.9 | HIP 71579 | 15.45 |
| 2026-05-31 12:00 | 14:37:05.40 | +09:49:58.0 | HIP 71395 | 16.81 |
| 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 |