C/1966 T1 (Rudnicki)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/1966 T1 (Rudnicki) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1967-01-20T21:13:46.761600Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:17Z |
| Obs used | 49 |
| NEO | - |
| M1 | 10.100 |
| K1 | 11.000 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 1966-11-19.0000000 |
| e | 1.00039019 |
| q (au) | 0.419209 |
| a (au) | -1074.385463 |
| i (deg) | 9.079808 |
| Ω (om, deg) | 75.708464 |
| ω (w, deg) | 79.785459 |
| M (ma, deg) | -0.001760 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.738 + 2.616\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.738 |
| n | 2.616 |
| gf | 0.800 |
| gb | -1.000 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 1966-10-20 | 1966-12-03 | +4.4444 | -0.492 |
| 1966-12-03 | 1967-01-04 | -6.0437 | -0.279 |
| 1967-01-28 | 1967-02-20 | +2.0211 | -0.017 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 22:09:11.31 | -20:29:51.8 | HIP 109223 | 26.83 |
| 2026-02-03 12:00 | 22:09:12.65 | -20:29:43.9 | HIP 109223 | 27.16 |
| 2026-02-04 00:00 | 22:09:14.00 | -20:29:35.9 | HIP 109223 | 27.49 |
| 2026-02-04 12:00 | 22:09:15.35 | -20:29:28.0 | HIP 109223 | 27.83 |
| 2026-02-05 00:00 | 22:09:16.70 | -20:29:20.1 | HIP 109223 | 28.16 |
| 2026-02-05 12:00 | 22:09:18.06 | -20:29:12.2 | HIP 109223 | 28.50 |
| 2026-02-06 00:00 | 22:09:19.41 | -20:29:04.3 | HIP 109223 | 28.83 |
| 2026-02-06 12:00 | 22:09:20.77 | -20:28:56.5 | HIP 109223 | 29.17 |
| 2026-02-07 00:00 | 22:09:22.14 | -20:28:48.6 | HIP 109223 | 29.51 |
| 2026-02-07 12:00 | 22:09:23.50 | -20:28:40.8 | HIP 109223 | 29.84 |
| 2026-02-08 00:00 | 22:09:24.87 | -20:28:32.9 | HIP 109223 | 30.18 |
| 2026-02-08 12:00 | 22:09:26.24 | -20:28:25.1 | HIP 109223 | 30.52 |
| 2026-02-09 00:00 | 22:09:27.61 | -20:28:17.3 | HIP 109223 | 30.86 |
| 2026-02-09 12:00 | 22:09:28.99 | -20:28:09.6 | HIP 109223 | 31.20 |
| 2026-02-10 00:00 | 22:09:30.37 | -20:28:01.8 | HIP 109223 | 31.54 |
| 2026-02-10 12:00 | 22:09:31.75 | -20:27:54.0 | HIP 109223 | 31.88 |
| 2026-02-11 00:00 | 22:09:33.13 | -20:27:46.3 | HIP 109223 | 32.22 |
| 2026-02-11 12:00 | 22:09:34.51 | -20:27:38.6 | HIP 109223 | 32.56 |
| 2026-02-12 00:00 | 22:09:35.89 | -20:27:30.9 | HIP 109223 | 32.90 |
| 2026-02-12 12:00 | 22:09:37.28 | -20:27:23.2 | HIP 109223 | 33.24 |
| 2026-02-13 00:00 | 22:09:38.66 | -20:27:15.6 | HIP 109223 | 33.58 |
| 2026-02-13 12:00 | 22:09:40.05 | -20:27:08.0 | HIP 109438 | 33.71 |
| 2026-02-14 00:00 | 22:09:41.44 | -20:27:00.4 | HIP 109391 | 33.65 |
| 2026-02-14 12:00 | 22:09:42.83 | -20:26:52.8 | HIP 109391 | 33.53 |
| 2026-02-15 00:00 | 22:09:44.22 | -20:26:45.2 | HIP 109391 | 33.40 |
| 2026-02-15 12:00 | 22:09:45.62 | -20:26:37.7 | HIP 109391 | 33.29 |
| 2026-02-16 00:00 | 22:09:47.01 | -20:26:30.2 | HIP 109391 | 33.17 |
| 2026-02-16 12:00 | 22:09:48.40 | -20:26:22.7 | HIP 109391 | 33.06 |
| 2026-02-17 00:00 | 22:09:49.80 | -20:26:15.2 | HIP 109391 | 32.95 |
| 2026-02-17 12:00 | 22:09:51.19 | -20:26:07.7 | HIP 109391 | 32.85 |
| 2026-02-18 00:00 | 22:09:52.59 | -20:26:00.3 | HIP 109391 | 32.75 |
| 2026-02-18 12:00 | 22:09:53.98 | -20:25:52.9 | HIP 109391 | 32.65 |
| 2026-02-19 00:00 | 22:09:55.38 | -20:25:45.6 | HIP 109391 | 32.56 |
| 2026-02-19 12:00 | 22:09:56.77 | -20:25:38.2 | HIP 109391 | 32.47 |
| 2026-02-20 00:00 | 22:09:58.17 | -20:25:30.9 | HIP 109391 | 32.39 |
| 2026-02-20 12:00 | 22:09:59.56 | -20:25:23.7 | HIP 109391 | 32.31 |
| 2026-02-21 00:00 | 22:10:00.96 | -20:25:16.4 | HIP 109391 | 32.23 |
| 2026-02-21 12:00 | 22:10:02.35 | -20:25:09.2 | HIP 109391 | 32.16 |
| 2026-02-22 00:00 | 22:10:03.75 | -20:25:02.0 | HIP 109391 | 32.10 |
| 2026-02-22 12:00 | 22:10:05.14 | -20:24:54.9 | HIP 109391 | 32.03 |
| 2026-02-23 00:00 | 22:10:06.53 | -20:24:47.7 | HIP 109391 | 31.97 |
| 2026-02-23 12:00 | 22:10:07.92 | -20:24:40.6 | HIP 109391 | 31.92 |
| 2026-02-24 00:00 | 22:10:09.31 | -20:24:33.6 | HIP 109391 | 31.87 |