C/1969 T1 (Tago-Sato-Kosaka)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/1969 T1 (Tago-Sato-Kosaka) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1969-12-21T06:25:38.887680Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:19Z |
| Obs used | 305 |
| NEO | - |
| M1 | 6.500 |
| K1 | 11.750 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 1970-01-21.0000000 |
| e | 0.99992618 |
| q (au) | 0.472639 |
| a (au) | 6402.315951 |
| i (deg) | 75.817750 |
| Ω (om, deg) | 101.659779 |
| ω (w, deg) | 267.834299 |
| M (ma, deg) | 0.000059 |
Magnitude
Scatter + Global Linear
$$ M_a = (6.542 + 2.871\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 6.542 |
| n | 2.871 |
| 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 |
|---|---|---|---|
| 1969-12-21 | 1970-01-01 | +6.5279 | +1.452 |
| 1970-01-01 | 1970-01-15 | +5.5386 | +1.384 |
| 1970-01-15 | 1970-02-06 | -4.9320 | +0.021 |
| 1970-02-06 | 1970-03-08 | +7.0879 | -1.200 |
| 1970-03-08 | 1970-05-01 | +0.8748 | +0.237 |
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 | 14:50:33.49 | +68:45:02.0 | HIP 72922 | 19.78 |
| 2026-05-12 12:00 | 14:50:29.77 | +68:45:00.4 | HIP 72922 | 20.12 |
| 2026-05-13 00:00 | 14:50:26.06 | +68:44:58.6 | HIP 72922 | 20.45 |
| 2026-05-13 12:00 | 14:50:22.35 | +68:44:56.6 | HIP 72922 | 20.79 |
| 2026-05-14 00:00 | 14:50:18.64 | +68:44:54.4 | HIP 72922 | 21.13 |
| 2026-05-14 12:00 | 14:50:14.94 | +68:44:52.0 | HIP 72922 | 21.47 |
| 2026-05-15 00:00 | 14:50:11.24 | +68:44:49.4 | HIP 72922 | 21.80 |
| 2026-05-15 12:00 | 14:50:07.55 | +68:44:46.6 | HIP 72922 | 22.14 |
| 2026-05-16 00:00 | 14:50:03.87 | +68:44:43.7 | HIP 72922 | 22.48 |
| 2026-05-16 12:00 | 14:50:00.19 | +68:44:40.6 | HIP 72922 | 22.81 |
| 2026-05-17 00:00 | 14:49:56.51 | +68:44:37.2 | HIP 72922 | 23.15 |
| 2026-05-17 12:00 | 14:49:52.85 | +68:44:33.7 | HIP 72922 | 23.49 |
| 2026-05-18 00:00 | 14:49:49.19 | +68:44:30.1 | HIP 72922 | 23.82 |
| 2026-05-18 12:00 | 14:49:45.54 | +68:44:26.2 | HIP 72922 | 24.16 |
| 2026-05-19 00:00 | 14:49:41.89 | +68:44:22.1 | HIP 72922 | 24.49 |
| 2026-05-19 12:00 | 14:49:38.25 | +68:44:17.9 | HIP 72922 | 24.83 |
| 2026-05-20 00:00 | 14:49:34.63 | +68:44:13.5 | HIP 72922 | 25.16 |
| 2026-05-20 12:00 | 14:49:31.01 | +68:44:08.9 | HIP 72922 | 25.50 |
| 2026-05-21 00:00 | 14:49:27.40 | +68:44:04.1 | HIP 72922 | 25.83 |
| 2026-05-21 12:00 | 14:49:23.79 | +68:43:59.1 | HIP 72922 | 26.16 |
| 2026-05-22 00:00 | 14:49:20.20 | +68:43:54.0 | HIP 72922 | 26.50 |
| 2026-05-22 12:00 | 14:49:16.62 | +68:43:48.7 | HIP 72922 | 26.83 |
| 2026-05-23 00:00 | 14:49:13.05 | +68:43:43.1 | HIP 72922 | 27.16 |
| 2026-05-23 12:00 | 14:49:09.49 | +68:43:37.5 | HIP 72922 | 27.49 |
| 2026-05-24 00:00 | 14:49:05.93 | +68:43:31.6 | HIP 72922 | 27.82 |
| 2026-05-24 12:00 | 14:49:02.39 | +68:43:25.6 | HIP 72922 | 28.15 |
| 2026-05-25 00:00 | 14:48:58.86 | +68:43:19.3 | HIP 72922 | 28.48 |
| 2026-05-25 12:00 | 14:48:55.34 | +68:43:13.0 | HIP 72922 | 28.81 |
| 2026-05-26 00:00 | 14:48:51.84 | +68:43:06.4 | HIP 72922 | 29.14 |
| 2026-05-26 12:00 | 14:48:48.34 | +68:42:59.6 | HIP 72922 | 29.47 |
| 2026-05-27 00:00 | 14:48:44.86 | +68:42:52.7 | HIP 72922 | 29.80 |
| 2026-05-27 12:00 | 14:48:41.39 | +68:42:45.6 | HIP 72320 | 29.86 |
| 2026-05-28 00:00 | 14:48:37.93 | +68:42:38.4 | HIP 72320 | 29.67 |
| 2026-05-28 12:00 | 14:48:34.48 | +68:42:30.9 | HIP 72320 | 29.47 |
| 2026-05-29 00:00 | 14:48:31.05 | +68:42:23.3 | HIP 72320 | 29.28 |
| 2026-05-29 12:00 | 14:48:27.63 | +68:42:15.6 | HIP 72320 | 29.09 |
| 2026-05-30 00:00 | 14:48:24.22 | +68:42:07.6 | HIP 72320 | 28.89 |
| 2026-05-30 12:00 | 14:48:20.83 | +68:41:59.5 | HIP 72320 | 28.70 |
| 2026-05-31 00:00 | 14:48:17.45 | +68:41:51.2 | HIP 72320 | 28.51 |
| 2026-05-31 12:00 | 14:48:14.09 | +68:41:42.8 | HIP 72320 | 28.31 |
| 2026-06-01 00:00 | 14:48:10.74 | +68:41:34.1 | HIP 72320 | 28.12 |
| 2026-06-01 12:00 | 14:48:07.41 | +68:41:25.3 | HIP 72320 | 27.93 |
| 2026-06-02 00:00 | 14:48:04.09 | +68:41:16.4 | HIP 72320 | 27.74 |