C/1962 C1 (Seki-Lines)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/1962 C1 (Seki-Lines) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1962-04-01T15:54:42.880320Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:14Z |
| Obs used | 32 |
| NEO | - |
| M1 | - |
| K1 | - |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 1962-05-30.0000000 |
| e | 1.00000446 |
| q (au) | 0.031398 |
| a (au) | -7039.189219 |
| i (deg) | 65.014482 |
| Ω (om, deg) | 304.677692 |
| ω (w, deg) | 11.473294 |
| M (ma, deg) | 0.000097 |
Magnitude
Scatter + Global Linear
$$ M_a = (5.920 + 3.807\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 5.920 |
| n | 3.807 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 1962-02-07 | 1962-03-27 | -0.1771 | +0.572 |
| 1962-04-03 | 1962-05-02 | -1.0610 | -0.178 |
| 1962-05-02 | 1963-01-25 | +9.7849 | +0.146 |
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 | 08:33:27.20 | +10:05:49.1 | HIP 41904 | 11.80 |
| 2026-06-01 12:00 | 08:33:27.91 | +10:05:48.8 | HIP 41904 | 11.97 |
| 2026-06-02 00:00 | 08:33:28.63 | +10:05:48.5 | HIP 41904 | 12.14 |
| 2026-06-02 12:00 | 08:33:29.36 | +10:05:48.1 | HIP 41904 | 12.32 |
| 2026-06-03 00:00 | 08:33:30.10 | +10:05:47.7 | HIP 41904 | 12.50 |
| 2026-06-03 12:00 | 08:33:30.84 | +10:05:47.3 | HIP 41904 | 12.68 |
| 2026-06-04 00:00 | 08:33:31.60 | +10:05:46.7 | HIP 41904 | 12.86 |
| 2026-06-04 12:00 | 08:33:32.36 | +10:05:46.2 | HIP 41904 | 13.05 |
| 2026-06-05 00:00 | 08:33:33.13 | +10:05:45.6 | HIP 41904 | 13.23 |
| 2026-06-05 12:00 | 08:33:33.91 | +10:05:44.9 | HIP 41904 | 13.42 |
| 2026-06-06 00:00 | 08:33:34.70 | +10:05:44.2 | HIP 41904 | 13.61 |
| 2026-06-06 12:00 | 08:33:35.49 | +10:05:43.5 | HIP 41904 | 13.80 |
| 2026-06-07 00:00 | 08:33:36.30 | +10:05:42.7 | HIP 41904 | 14.00 |
| 2026-06-07 12:00 | 08:33:37.11 | +10:05:41.9 | HIP 41904 | 14.20 |
| 2026-06-08 00:00 | 08:33:37.93 | +10:05:41.0 | HIP 41904 | 14.39 |
| 2026-06-08 12:00 | 08:33:38.76 | +10:05:40.1 | HIP 41904 | 14.59 |
| 2026-06-09 00:00 | 08:33:39.59 | +10:05:39.1 | HIP 41904 | 14.80 |
| 2026-06-09 12:00 | 08:33:40.44 | +10:05:38.1 | HIP 41904 | 15.00 |
| 2026-06-10 00:00 | 08:33:41.29 | +10:05:37.0 | HIP 41904 | 15.21 |
| 2026-06-10 12:00 | 08:33:42.15 | +10:05:35.9 | HIP 41904 | 15.42 |
| 2026-06-11 00:00 | 08:33:43.01 | +10:05:34.7 | HIP 41904 | 15.63 |
| 2026-06-11 12:00 | 08:33:43.89 | +10:05:33.5 | HIP 41904 | 15.84 |
| 2026-06-12 00:00 | 08:33:44.77 | +10:05:32.3 | HIP 41904 | 16.05 |
| 2026-06-12 12:00 | 08:33:45.66 | +10:05:31.0 | HIP 41904 | 16.27 |
| 2026-06-13 00:00 | 08:33:46.56 | +10:05:29.6 | HIP 41904 | 16.49 |
| 2026-06-13 12:00 | 08:33:47.46 | +10:05:28.3 | HIP 41904 | 16.71 |
| 2026-06-14 00:00 | 08:33:48.38 | +10:05:26.8 | HIP 41904 | 16.93 |
| 2026-06-14 12:00 | 08:33:49.30 | +10:05:25.3 | HIP 41904 | 17.15 |
| 2026-06-15 00:00 | 08:33:50.22 | +10:05:23.8 | HIP 41904 | 17.38 |
| 2026-06-15 12:00 | 08:33:51.16 | +10:05:22.2 | HIP 41904 | 17.60 |
| 2026-06-16 00:00 | 08:33:52.10 | +10:05:20.6 | HIP 41904 | 17.83 |
| 2026-06-16 12:00 | 08:33:53.05 | +10:05:19.0 | HIP 41904 | 18.06 |
| 2026-06-17 00:00 | 08:33:54.00 | +10:05:17.3 | HIP 41904 | 18.30 |
| 2026-06-17 12:00 | 08:33:54.96 | +10:05:15.5 | HIP 41904 | 18.53 |
| 2026-06-18 00:00 | 08:33:55.93 | +10:05:13.7 | HIP 41904 | 18.77 |
| 2026-06-18 12:00 | 08:33:56.91 | +10:05:11.9 | HIP 41904 | 19.00 |
| 2026-06-19 00:00 | 08:33:57.89 | +10:05:10.0 | HIP 41904 | 19.24 |
| 2026-06-19 12:00 | 08:33:58.88 | +10:05:08.1 | HIP 41904 | 19.48 |
| 2026-06-20 00:00 | 08:33:59.87 | +10:05:06.1 | HIP 41904 | 19.73 |
| 2026-06-20 12:00 | 08:34:00.87 | +10:05:04.1 | HIP 41904 | 19.97 |
| 2026-06-21 00:00 | 08:34:01.88 | +10:05:02.0 | HIP 41904 | 20.22 |
| 2026-06-21 12:00 | 08:34:02.89 | +10:05:00.0 | HIP 41904 | 20.46 |
| 2026-06-22 00:00 | 08:34:03.91 | +10:04:57.8 | HIP 41904 | 20.71 |