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 | 1962-05-17 | +0.1121 | +0.201 |
| 1962-05-17 | 1963-01-25 | +8.9374 | +0.332 |
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 | 08:35:14.11 | +09:50:20.0 | HIP 42159 | 21.32 |
| 2026-02-03 12:00 | 08:35:12.79 | +09:50:25.3 | HIP 42159 | 21.50 |
| 2026-02-04 00:00 | 08:35:11.47 | +09:50:30.6 | HIP 42159 | 21.68 |
| 2026-02-04 12:00 | 08:35:10.16 | +09:50:35.9 | HIP 42159 | 21.87 |
| 2026-02-05 00:00 | 08:35:08.84 | +09:50:41.3 | HIP 42159 | 22.07 |
| 2026-02-05 12:00 | 08:35:07.53 | +09:50:46.7 | HIP 42159 | 22.26 |
| 2026-02-06 00:00 | 08:35:06.22 | +09:50:52.1 | HIP 42159 | 22.46 |
| 2026-02-06 12:00 | 08:35:04.91 | +09:50:57.5 | HIP 42159 | 22.66 |
| 2026-02-07 00:00 | 08:35:03.61 | +09:51:02.9 | HIP 42159 | 22.87 |
| 2026-02-07 12:00 | 08:35:02.30 | +09:51:08.3 | HIP 42159 | 23.08 |
| 2026-02-08 00:00 | 08:35:01.00 | +09:51:13.8 | HIP 42159 | 23.29 |
| 2026-02-08 12:00 | 08:34:59.70 | +09:51:19.3 | HIP 42159 | 23.51 |
| 2026-02-09 00:00 | 08:34:58.41 | +09:51:24.8 | HIP 42159 | 23.72 |
| 2026-02-09 12:00 | 08:34:57.12 | +09:51:30.3 | HIP 42159 | 23.94 |
| 2026-02-10 00:00 | 08:34:55.83 | +09:51:35.8 | HIP 42159 | 24.17 |
| 2026-02-10 12:00 | 08:34:54.54 | +09:51:41.4 | HIP 42159 | 24.39 |
| 2026-02-11 00:00 | 08:34:53.25 | +09:51:46.9 | HIP 42159 | 24.62 |
| 2026-02-11 12:00 | 08:34:51.97 | +09:51:52.5 | HIP 42159 | 24.85 |
| 2026-02-12 00:00 | 08:34:50.69 | +09:51:58.1 | HIP 42159 | 25.08 |
| 2026-02-12 12:00 | 08:34:49.42 | +09:52:03.7 | HIP 42159 | 25.31 |
| 2026-02-13 00:00 | 08:34:48.15 | +09:52:09.3 | HIP 42159 | 25.55 |
| 2026-02-13 12:00 | 08:34:46.88 | +09:52:14.9 | HIP 42159 | 25.78 |
| 2026-02-14 00:00 | 08:34:45.62 | +09:52:20.6 | HIP 42159 | 26.02 |
| 2026-02-14 12:00 | 08:34:44.36 | +09:52:26.2 | HIP 42159 | 26.26 |
| 2026-02-15 00:00 | 08:34:43.10 | +09:52:31.9 | HIP 42159 | 26.50 |
| 2026-02-15 12:00 | 08:34:41.85 | +09:52:37.6 | HIP 42159 | 26.75 |
| 2026-02-16 00:00 | 08:34:40.60 | +09:52:43.2 | HIP 42159 | 26.99 |
| 2026-02-16 12:00 | 08:34:39.36 | +09:52:48.9 | HIP 42159 | 27.24 |
| 2026-02-17 00:00 | 08:34:38.12 | +09:52:54.6 | HIP 42159 | 27.48 |
| 2026-02-17 12:00 | 08:34:36.88 | +09:53:00.3 | HIP 42159 | 27.73 |
| 2026-02-18 00:00 | 08:34:35.65 | +09:53:06.1 | HIP 42159 | 27.98 |
| 2026-02-18 12:00 | 08:34:34.43 | +09:53:11.8 | HIP 42159 | 28.23 |
| 2026-02-19 00:00 | 08:34:33.20 | +09:53:17.5 | HIP 42159 | 28.48 |
| 2026-02-19 12:00 | 08:34:31.99 | +09:53:23.2 | HIP 42159 | 28.73 |
| 2026-02-20 00:00 | 08:34:30.78 | +09:53:29.0 | HIP 42159 | 28.98 |
| 2026-02-20 12:00 | 08:34:29.57 | +09:53:34.7 | HIP 41904 | 28.94 |
| 2026-02-21 00:00 | 08:34:28.37 | +09:53:40.5 | HIP 41904 | 28.63 |
| 2026-02-21 12:00 | 08:34:27.17 | +09:53:46.2 | HIP 41904 | 28.32 |
| 2026-02-22 00:00 | 08:34:25.98 | +09:53:52.0 | HIP 41904 | 28.01 |
| 2026-02-22 12:00 | 08:34:24.79 | +09:53:57.8 | HIP 41904 | 27.70 |
| 2026-02-23 00:00 | 08:34:23.61 | +09:54:03.5 | HIP 41904 | 27.40 |
| 2026-02-23 12:00 | 08:34:22.44 | +09:54:09.3 | HIP 41904 | 27.09 |
| 2026-02-24 00:00 | 08:34:21.27 | +09:54:15.1 | HIP 41904 | 26.79 |