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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 08:33:06.45 | +10:05:21.5 | HIP 41904 | 6.69 |
| 2026-05-12 12:00 | 08:33:06.78 | +10:05:23.1 | HIP 41904 | 6.77 |
| 2026-05-13 00:00 | 08:33:07.11 | +10:05:24.7 | HIP 41904 | 6.86 |
| 2026-05-13 12:00 | 08:33:07.45 | +10:05:26.2 | HIP 41904 | 6.95 |
| 2026-05-14 00:00 | 08:33:07.81 | +10:05:27.6 | HIP 41904 | 7.04 |
| 2026-05-14 12:00 | 08:33:08.17 | +10:05:29.1 | HIP 41904 | 7.13 |
| 2026-05-15 00:00 | 08:33:08.55 | +10:05:30.4 | HIP 41904 | 7.23 |
| 2026-05-15 12:00 | 08:33:08.94 | +10:05:31.8 | HIP 41904 | 7.32 |
| 2026-05-16 00:00 | 08:33:09.33 | +10:05:33.0 | HIP 41904 | 7.42 |
| 2026-05-16 12:00 | 08:33:09.74 | +10:05:34.3 | HIP 41904 | 7.53 |
| 2026-05-17 00:00 | 08:33:10.16 | +10:05:35.5 | HIP 41904 | 7.63 |
| 2026-05-17 12:00 | 08:33:10.58 | +10:05:36.6 | HIP 41904 | 7.74 |
| 2026-05-18 00:00 | 08:33:11.02 | +10:05:37.7 | HIP 41904 | 7.85 |
| 2026-05-18 12:00 | 08:33:11.47 | +10:05:38.7 | HIP 41904 | 7.96 |
| 2026-05-19 00:00 | 08:33:11.93 | +10:05:39.7 | HIP 41904 | 8.07 |
| 2026-05-19 12:00 | 08:33:12.39 | +10:05:40.7 | HIP 41904 | 8.19 |
| 2026-05-20 00:00 | 08:33:12.87 | +10:05:41.6 | HIP 41904 | 8.31 |
| 2026-05-20 12:00 | 08:33:13.36 | +10:05:42.5 | HIP 41904 | 8.43 |
| 2026-05-21 00:00 | 08:33:13.86 | +10:05:43.3 | HIP 41904 | 8.55 |
| 2026-05-21 12:00 | 08:33:14.36 | +10:05:44.0 | HIP 41904 | 8.67 |
| 2026-05-22 00:00 | 08:33:14.88 | +10:05:44.7 | HIP 41904 | 8.80 |
| 2026-05-22 12:00 | 08:33:15.41 | +10:05:45.4 | HIP 41904 | 8.93 |
| 2026-05-23 00:00 | 08:33:15.94 | +10:05:46.0 | HIP 41904 | 9.06 |
| 2026-05-23 12:00 | 08:33:16.49 | +10:05:46.6 | HIP 41904 | 9.20 |
| 2026-05-24 00:00 | 08:33:17.05 | +10:05:47.1 | HIP 41904 | 9.33 |
| 2026-05-24 12:00 | 08:33:17.61 | +10:05:47.6 | HIP 41904 | 9.47 |
| 2026-05-25 00:00 | 08:33:18.19 | +10:05:48.0 | HIP 41904 | 9.61 |
| 2026-05-25 12:00 | 08:33:18.77 | +10:05:48.4 | HIP 41904 | 9.75 |
| 2026-05-26 00:00 | 08:33:19.36 | +10:05:48.7 | HIP 41904 | 9.90 |
| 2026-05-26 12:00 | 08:33:19.97 | +10:05:49.0 | HIP 41904 | 10.04 |
| 2026-05-27 00:00 | 08:33:20.58 | +10:05:49.3 | HIP 41904 | 10.19 |
| 2026-05-27 12:00 | 08:33:21.20 | +10:05:49.5 | HIP 41904 | 10.34 |
| 2026-05-28 00:00 | 08:33:21.83 | +10:05:49.6 | HIP 41904 | 10.50 |
| 2026-05-28 12:00 | 08:33:22.47 | +10:05:49.7 | HIP 41904 | 10.65 |
| 2026-05-29 00:00 | 08:33:23.12 | +10:05:49.8 | HIP 41904 | 10.81 |
| 2026-05-29 12:00 | 08:33:23.78 | +10:05:49.8 | HIP 41904 | 10.97 |
| 2026-05-30 00:00 | 08:33:24.44 | +10:05:49.7 | HIP 41904 | 11.13 |
| 2026-05-30 12:00 | 08:33:25.12 | +10:05:49.6 | HIP 41904 | 11.29 |
| 2026-05-31 00:00 | 08:33:25.80 | +10:05:49.5 | HIP 41904 | 11.46 |
| 2026-05-31 12:00 | 08:33:26.50 | +10:05:49.3 | HIP 41904 | 11.63 |
| 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 |