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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 08:33:24.35 | +09:59:48.8 | HIP 41904 | 11.71 |
| 2026-03-26 12:00 | 08:33:23.66 | +09:59:53.9 | HIP 41904 | 11.52 |
| 2026-03-27 00:00 | 08:33:22.99 | +09:59:59.0 | HIP 41904 | 11.34 |
| 2026-03-27 12:00 | 08:33:22.32 | +10:00:04.0 | HIP 41904 | 11.15 |
| 2026-03-28 00:00 | 08:33:21.67 | +10:00:09.0 | HIP 41904 | 10.97 |
| 2026-03-28 12:00 | 08:33:21.02 | +10:00:14.0 | HIP 41904 | 10.80 |
| 2026-03-29 00:00 | 08:33:20.39 | +10:00:19.0 | HIP 41904 | 10.62 |
| 2026-03-29 12:00 | 08:33:19.77 | +10:00:23.9 | HIP 41904 | 10.45 |
| 2026-03-30 00:00 | 08:33:19.15 | +10:00:28.8 | HIP 41904 | 10.28 |
| 2026-03-30 12:00 | 08:33:18.55 | +10:00:33.7 | HIP 41904 | 10.11 |
| 2026-03-31 00:00 | 08:33:17.95 | +10:00:38.5 | HIP 41904 | 9.95 |
| 2026-03-31 12:00 | 08:33:17.37 | +10:00:43.4 | HIP 41904 | 9.78 |
| 2026-04-01 00:00 | 08:33:16.80 | +10:00:48.2 | HIP 41904 | 9.62 |
| 2026-04-01 12:00 | 08:33:16.23 | +10:00:52.9 | HIP 41904 | 9.47 |
| 2026-04-02 00:00 | 08:33:15.68 | +10:00:57.7 | HIP 41904 | 9.31 |
| 2026-04-02 12:00 | 08:33:15.14 | +10:01:02.4 | HIP 41904 | 9.16 |
| 2026-04-03 00:00 | 08:33:14.60 | +10:01:07.1 | HIP 41904 | 9.01 |
| 2026-04-03 12:00 | 08:33:14.08 | +10:01:11.8 | HIP 41904 | 8.86 |
| 2026-04-04 00:00 | 08:33:13.57 | +10:01:16.4 | HIP 41904 | 8.72 |
| 2026-04-04 12:00 | 08:33:13.07 | +10:01:21.0 | HIP 41904 | 8.58 |
| 2026-04-05 00:00 | 08:33:12.58 | +10:01:25.6 | HIP 41904 | 8.44 |
| 2026-04-05 12:00 | 08:33:12.10 | +10:01:30.1 | HIP 41904 | 8.31 |
| 2026-04-06 00:00 | 08:33:11.63 | +10:01:34.6 | HIP 41904 | 8.17 |
| 2026-04-06 12:00 | 08:33:11.17 | +10:01:39.1 | HIP 41904 | 8.04 |
| 2026-04-07 00:00 | 08:33:10.72 | +10:01:43.5 | HIP 41904 | 7.92 |
| 2026-04-07 12:00 | 08:33:10.28 | +10:01:48.0 | HIP 41904 | 7.79 |
| 2026-04-08 00:00 | 08:33:09.85 | +10:01:52.3 | HIP 41904 | 7.67 |
| 2026-04-08 12:00 | 08:33:09.44 | +10:01:56.7 | HIP 41904 | 7.55 |
| 2026-04-09 00:00 | 08:33:09.03 | +10:02:01.0 | HIP 41904 | 7.44 |
| 2026-04-09 12:00 | 08:33:08.64 | +10:02:05.3 | HIP 41904 | 7.33 |
| 2026-04-10 00:00 | 08:33:08.25 | +10:02:09.6 | HIP 41904 | 7.22 |
| 2026-04-10 12:00 | 08:33:07.88 | +10:02:13.8 | HIP 41904 | 7.11 |
| 2026-04-11 00:00 | 08:33:07.52 | +10:02:18.0 | HIP 41904 | 7.01 |
| 2026-04-11 12:00 | 08:33:07.16 | +10:02:22.1 | HIP 41904 | 6.91 |
| 2026-04-12 00:00 | 08:33:06.82 | +10:02:26.3 | HIP 41904 | 6.81 |
| 2026-04-12 12:00 | 08:33:06.49 | +10:02:30.3 | HIP 41904 | 6.71 |
| 2026-04-13 00:00 | 08:33:06.17 | +10:02:34.4 | HIP 41904 | 6.62 |
| 2026-04-13 12:00 | 08:33:05.86 | +10:02:38.4 | HIP 41904 | 6.53 |
| 2026-04-14 00:00 | 08:33:05.57 | +10:02:42.4 | HIP 41904 | 6.45 |
| 2026-04-14 12:00 | 08:33:05.28 | +10:02:46.3 | HIP 41904 | 6.37 |
| 2026-04-15 00:00 | 08:33:05.00 | +10:02:50.3 | HIP 41904 | 6.29 |
| 2026-04-15 12:00 | 08:33:04.74 | +10:02:54.1 | HIP 41904 | 6.21 |
| 2026-04-16 00:00 | 08:33:04.49 | +10:02:58.0 | HIP 41904 | 6.14 |