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 | -0.500 |
| 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 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 22:12:39.70 | -20:18:46.2 | HIP 109652 | 34.69 |
| 2026-06-01 12:00 | 22:12:39.51 | -20:18:50.4 | HIP 109652 | 34.62 |
| 2026-06-02 00:00 | 22:12:39.30 | -20:18:54.8 | HIP 109652 | 34.55 |
| 2026-06-02 12:00 | 22:12:39.08 | -20:18:59.2 | HIP 109652 | 34.48 |
| 2026-06-03 00:00 | 22:12:38.85 | -20:19:03.6 | HIP 109652 | 34.41 |
| 2026-06-03 12:00 | 22:12:38.61 | -20:19:08.1 | HIP 109652 | 34.34 |
| 2026-06-04 00:00 | 22:12:38.36 | -20:19:12.7 | HIP 109652 | 34.26 |
| 2026-06-04 12:00 | 22:12:38.10 | -20:19:17.3 | HIP 109652 | 34.19 |
| 2026-06-05 00:00 | 22:12:37.83 | -20:19:21.9 | HIP 109652 | 34.12 |
| 2026-06-05 12:00 | 22:12:37.54 | -20:19:26.6 | HIP 109652 | 34.04 |
| 2026-06-06 00:00 | 22:12:37.24 | -20:19:31.4 | HIP 109652 | 33.97 |
| 2026-06-06 12:00 | 22:12:36.94 | -20:19:36.2 | HIP 109652 | 33.89 |
| 2026-06-07 00:00 | 22:12:36.62 | -20:19:41.1 | HIP 109652 | 33.82 |
| 2026-06-07 12:00 | 22:12:36.29 | -20:19:46.0 | HIP 109652 | 33.74 |
| 2026-06-08 00:00 | 22:12:35.95 | -20:19:51.0 | HIP 109652 | 33.66 |
| 2026-06-08 12:00 | 22:12:35.59 | -20:19:56.0 | HIP 109652 | 33.59 |
| 2026-06-09 00:00 | 22:12:35.23 | -20:20:01.1 | HIP 109652 | 33.51 |
| 2026-06-09 12:00 | 22:12:34.86 | -20:20:06.2 | HIP 109652 | 33.43 |
| 2026-06-10 00:00 | 22:12:34.47 | -20:20:11.4 | HIP 109652 | 33.35 |
| 2026-06-10 12:00 | 22:12:34.07 | -20:20:16.7 | HIP 109652 | 33.27 |
| 2026-06-11 00:00 | 22:12:33.67 | -20:20:21.9 | HIP 109652 | 33.19 |
| 2026-06-11 12:00 | 22:12:33.25 | -20:20:27.3 | HIP 109652 | 33.12 |
| 2026-06-12 00:00 | 22:12:32.82 | -20:20:32.7 | HIP 109652 | 33.04 |
| 2026-06-12 12:00 | 22:12:32.38 | -20:20:38.1 | HIP 109652 | 32.96 |
| 2026-06-13 00:00 | 22:12:31.93 | -20:20:43.6 | HIP 109652 | 32.88 |
| 2026-06-13 12:00 | 22:12:31.46 | -20:20:49.1 | HIP 109652 | 32.80 |
| 2026-06-14 00:00 | 22:12:30.99 | -20:20:54.7 | HIP 109652 | 32.72 |
| 2026-06-14 12:00 | 22:12:30.51 | -20:21:00.3 | HIP 109652 | 32.64 |
| 2026-06-15 00:00 | 22:12:30.01 | -20:21:06.0 | HIP 109652 | 32.56 |
| 2026-06-15 12:00 | 22:12:29.50 | -20:21:11.7 | HIP 109652 | 32.48 |
| 2026-06-16 00:00 | 22:12:28.99 | -20:21:17.5 | HIP 109652 | 32.40 |
| 2026-06-16 12:00 | 22:12:28.46 | -20:21:23.3 | HIP 109652 | 32.32 |
| 2026-06-17 00:00 | 22:12:27.92 | -20:21:29.1 | HIP 109652 | 32.24 |
| 2026-06-17 12:00 | 22:12:27.37 | -20:21:35.0 | HIP 109652 | 32.16 |
| 2026-06-18 00:00 | 22:12:26.81 | -20:21:41.0 | HIP 109652 | 32.08 |
| 2026-06-18 12:00 | 22:12:26.24 | -20:21:47.0 | HIP 109652 | 32.00 |
| 2026-06-19 00:00 | 22:12:25.66 | -20:21:53.0 | HIP 109652 | 31.92 |
| 2026-06-19 12:00 | 22:12:25.07 | -20:21:59.1 | HIP 109652 | 31.84 |
| 2026-06-20 00:00 | 22:12:24.47 | -20:22:05.2 | HIP 109652 | 31.76 |
| 2026-06-20 12:00 | 22:12:23.86 | -20:22:11.3 | HIP 109652 | 31.69 |
| 2026-06-21 00:00 | 22:12:23.24 | -20:22:17.5 | HIP 109652 | 31.61 |
| 2026-06-21 12:00 | 22:12:22.61 | -20:22:23.8 | HIP 109652 | 31.53 |
| 2026-06-22 00:00 | 22:12:21.96 | -20:22:30.0 | HIP 109652 | 31.46 |