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 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 22:12:38.08 | -20:16:43.9 | HIP 109652 | 36.74 |
| 2026-05-12 12:00 | 22:12:38.34 | -20:16:45.7 | HIP 109652 | 36.71 |
| 2026-05-13 00:00 | 22:12:38.60 | -20:16:47.6 | HIP 109652 | 36.68 |
| 2026-05-13 12:00 | 22:12:38.84 | -20:16:49.6 | HIP 109652 | 36.64 |
| 2026-05-14 00:00 | 22:12:39.07 | -20:16:51.6 | HIP 109652 | 36.60 |
| 2026-05-14 12:00 | 22:12:39.29 | -20:16:53.7 | HIP 109652 | 36.57 |
| 2026-05-15 00:00 | 22:12:39.50 | -20:16:55.9 | HIP 109652 | 36.53 |
| 2026-05-15 12:00 | 22:12:39.69 | -20:16:58.1 | HIP 109652 | 36.49 |
| 2026-05-16 00:00 | 22:12:39.88 | -20:17:00.4 | HIP 109652 | 36.45 |
| 2026-05-16 12:00 | 22:12:40.05 | -20:17:02.7 | HIP 109652 | 36.41 |
| 2026-05-17 00:00 | 22:12:40.21 | -20:17:05.1 | HIP 109652 | 36.37 |
| 2026-05-17 12:00 | 22:12:40.36 | -20:17:07.6 | HIP 109652 | 36.32 |
| 2026-05-18 00:00 | 22:12:40.50 | -20:17:10.1 | HIP 109652 | 36.28 |
| 2026-05-18 12:00 | 22:12:40.63 | -20:17:12.7 | HIP 109652 | 36.24 |
| 2026-05-19 00:00 | 22:12:40.74 | -20:17:15.4 | HIP 109652 | 36.19 |
| 2026-05-19 12:00 | 22:12:40.85 | -20:17:18.1 | HIP 109652 | 36.14 |
| 2026-05-20 00:00 | 22:12:40.94 | -20:17:20.9 | HIP 109652 | 36.10 |
| 2026-05-20 12:00 | 22:12:41.02 | -20:17:23.8 | HIP 109652 | 36.05 |
| 2026-05-21 00:00 | 22:12:41.09 | -20:17:26.7 | HIP 109652 | 36.00 |
| 2026-05-21 12:00 | 22:12:41.15 | -20:17:29.7 | HIP 109652 | 35.95 |
| 2026-05-22 00:00 | 22:12:41.19 | -20:17:32.7 | HIP 109652 | 35.90 |
| 2026-05-22 12:00 | 22:12:41.23 | -20:17:35.8 | HIP 109652 | 35.85 |
| 2026-05-23 00:00 | 22:12:41.25 | -20:17:39.0 | HIP 109652 | 35.79 |
| 2026-05-23 12:00 | 22:12:41.26 | -20:17:42.2 | HIP 109652 | 35.74 |
| 2026-05-24 00:00 | 22:12:41.26 | -20:17:45.5 | HIP 109652 | 35.68 |
| 2026-05-24 12:00 | 22:12:41.25 | -20:17:48.9 | HIP 109652 | 35.63 |
| 2026-05-25 00:00 | 22:12:41.23 | -20:17:52.3 | HIP 109652 | 35.57 |
| 2026-05-25 12:00 | 22:12:41.19 | -20:17:55.7 | HIP 109652 | 35.51 |
| 2026-05-26 00:00 | 22:12:41.15 | -20:17:59.3 | HIP 109652 | 35.46 |
| 2026-05-26 12:00 | 22:12:41.09 | -20:18:02.9 | HIP 109652 | 35.40 |
| 2026-05-27 00:00 | 22:12:41.02 | -20:18:06.5 | HIP 109652 | 35.34 |
| 2026-05-27 12:00 | 22:12:40.94 | -20:18:10.2 | HIP 109652 | 35.28 |
| 2026-05-28 00:00 | 22:12:40.85 | -20:18:14.0 | HIP 109652 | 35.21 |
| 2026-05-28 12:00 | 22:12:40.74 | -20:18:17.8 | HIP 109652 | 35.15 |
| 2026-05-29 00:00 | 22:12:40.63 | -20:18:21.7 | HIP 109652 | 35.09 |
| 2026-05-29 12:00 | 22:12:40.50 | -20:18:25.6 | HIP 109652 | 35.02 |
| 2026-05-30 00:00 | 22:12:40.37 | -20:18:29.6 | HIP 109652 | 34.96 |
| 2026-05-30 12:00 | 22:12:40.22 | -20:18:33.7 | HIP 109652 | 34.89 |
| 2026-05-31 00:00 | 22:12:40.06 | -20:18:37.8 | HIP 109652 | 34.83 |
| 2026-05-31 12:00 | 22:12:39.88 | -20:18:41.9 | HIP 109652 | 34.76 |
| 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 |