49P/Arend-Rigaux
Metadata
| Parameter | Value |
|---|---|
| Designation | 49P/Arend-Rigaux |
| Type | P |
| Perihelion (tp_cal, UTC) | 2011-10-19T07:02:01.731840Z |
| Orbit solution date (soln_date, UTC) | 2026-01-08T08:26:32Z |
| Obs used | 4357 |
| NEO | - |
| M1 | 13.800 |
| K1 | 6.750 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2014-10-02.0000000 |
| e | 0.60025615 |
| q (au) | 1.425731 |
| a (au) | 3.566612 |
| i (deg) | 19.056274 |
| Ω (om, deg) | 118.831722 |
| ω (w, deg) | 332.920642 |
| M (ma, deg) | 157.842437 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.639 + 5.950\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.639 |
| n | 5.950 |
| gf | 0.800 |
| gb | -0.932 |
| 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 | +6.0117 | -1.472 |
| 2024-11-21 | 2024-08-28 | +0.0401 | +0.140 |
| 2024-08-28 | 2023-10-24 | -12.0910 | +4.969 |
| 2023-10-24 | 2025-05-25 | +50.9222 | -34.983 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 15:20:08.37 | +02:06:31.6 | HIP 75044 | 12.56 |
| 2026-02-03 12:00 | 15:20:27.17 | +02:08:13.5 | HIP 75044 | 12.09 |
| 2026-02-04 00:00 | 15:20:45.69 | +02:09:57.1 | HIP 75044 | 13.51 |
| 2026-02-04 12:00 | 15:21:03.94 | +02:11:42.4 | HIP 75044 | 16.29 |
| 2026-02-05 00:00 | 15:21:21.91 | +02:13:29.4 | HIP 75222 | 19.30 |
| 2026-02-05 12:00 | 15:21:39.60 | +02:15:18.1 | HIP 75271 | 16.47 |
| 2026-02-06 00:00 | 15:21:57.01 | +02:17:08.5 | HIP 75271 | 12.88 |
| 2026-02-06 12:00 | 15:22:14.15 | +02:19:00.6 | HIP 75271 | 10.34 |
| 2026-02-07 00:00 | 15:22:30.99 | +02:20:54.4 | HIP 75271 | 9.61 |
| 2026-02-07 12:00 | 15:22:47.56 | +02:22:49.8 | HIP 75271 | 11.00 |
| 2026-02-08 00:00 | 15:23:03.83 | +02:24:46.9 | HIP 75271 | 13.82 |
| 2026-02-08 12:00 | 15:23:19.82 | +02:26:45.7 | HIP 75375 | 13.69 |
| 2026-02-09 00:00 | 15:23:35.53 | +02:28:46.2 | HIP 75375 | 11.60 |
| 2026-02-09 12:00 | 15:23:50.94 | +02:30:48.2 | HIP 75375 | 11.04 |
| 2026-02-10 00:00 | 15:24:06.06 | +02:32:52.0 | HIP 75375 | 12.16 |
| 2026-02-10 12:00 | 15:24:20.88 | +02:34:57.3 | HIP 75392 | 12.88 |
| 2026-02-11 00:00 | 15:24:35.41 | +02:37:04.3 | HIP 75392 | 11.48 |
| 2026-02-11 12:00 | 15:24:49.65 | +02:39:12.9 | HIP 75392 | 11.47 |
| 2026-02-12 00:00 | 15:25:03.58 | +02:41:23.1 | HIP 75392 | 12.79 |
| 2026-02-12 12:00 | 15:25:17.22 | +02:43:34.9 | HIP 75392 | 15.06 |
| 2026-02-13 00:00 | 15:25:30.55 | +02:45:48.3 | HIP 75392 | 17.89 |
| 2026-02-13 12:00 | 15:25:43.59 | +02:48:03.3 | HIP 75392 | 21.03 |
| 2026-02-14 00:00 | 15:25:56.32 | +02:50:19.8 | HIP 75392 | 24.34 |
| 2026-02-14 12:00 | 15:26:08.74 | +02:52:37.8 | HIP 75643 | 21.34 |
| 2026-02-15 00:00 | 15:26:20.86 | +02:54:57.4 | HIP 75643 | 17.52 |
| 2026-02-15 12:00 | 15:26:32.67 | +02:57:18.6 | HIP 75643 | 13.75 |
| 2026-02-16 00:00 | 15:26:44.17 | +02:59:41.2 | HIP 75643 | 10.03 |
| 2026-02-16 12:00 | 15:26:55.37 | +03:02:05.4 | HIP 75643 | 6.36 |
| 2026-02-17 00:00 | 15:27:06.25 | +03:04:31.0 | HIP 75643 | 2.81 |
| 2026-02-17 12:00 | 15:27:16.81 | +03:06:58.1 | HIP 75643 | 1.38 |
| 2026-02-18 00:00 | 15:27:27.07 | +03:09:26.7 | HIP 75643 | 4.65 |
| 2026-02-18 12:00 | 15:27:37.01 | +03:11:56.7 | HIP 75643 | 8.14 |
| 2026-02-19 00:00 | 15:27:46.63 | +03:14:28.1 | HIP 75643 | 11.61 |
| 2026-02-19 12:00 | 15:27:55.93 | +03:17:01.0 | HIP 75643 | 15.06 |
| 2026-02-20 00:00 | 15:28:04.92 | +03:19:35.2 | HIP 75773 | 12.63 |
| 2026-02-20 12:00 | 15:28:13.59 | +03:22:10.9 | HIP 75773 | 9.41 |
| 2026-02-21 00:00 | 15:28:21.94 | +03:24:47.8 | HIP 75773 | 6.41 |
| 2026-02-21 12:00 | 15:28:29.96 | +03:27:26.2 | HIP 75773 | 4.09 |
| 2026-02-22 00:00 | 15:28:37.67 | +03:30:05.8 | HIP 75773 | 3.85 |
| 2026-02-22 12:00 | 15:28:45.05 | +03:32:46.8 | HIP 75773 | 5.90 |
| 2026-02-23 00:00 | 15:28:52.11 | +03:35:29.1 | HIP 75773 | 8.72 |
| 2026-02-23 12:00 | 15:28:58.85 | +03:38:12.6 | HIP 75773 | 11.75 |
| 2026-02-24 00:00 | 15:29:05.26 | +03:40:57.4 | HIP 75773 | 14.85 |