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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 14:48:00.78 | +68:41:07.3 | HIP 72320 | 27.54 |
| 2026-06-03 00:00 | 14:47:57.49 | +68:40:58.0 | HIP 72320 | 27.35 |
| 2026-06-03 12:00 | 14:47:54.22 | +68:40:48.5 | HIP 72320 | 27.16 |
| 2026-06-04 00:00 | 14:47:50.96 | +68:40:38.9 | HIP 72320 | 26.97 |
| 2026-06-04 12:00 | 14:47:47.72 | +68:40:29.1 | HIP 72320 | 26.78 |
| 2026-06-05 00:00 | 14:47:44.49 | +68:40:19.2 | HIP 72320 | 26.59 |
| 2026-06-05 12:00 | 14:47:41.28 | +68:40:09.1 | HIP 72320 | 26.40 |
| 2026-06-06 00:00 | 14:47:38.09 | +68:39:58.8 | HIP 72320 | 26.21 |
| 2026-06-06 12:00 | 14:47:34.92 | +68:39:48.4 | HIP 72320 | 26.02 |
| 2026-06-07 00:00 | 14:47:31.76 | +68:39:37.8 | HIP 72320 | 25.83 |
| 2026-06-07 12:00 | 14:47:28.62 | +68:39:27.1 | HIP 72320 | 25.64 |
| 2026-06-08 00:00 | 14:47:25.50 | +68:39:16.2 | HIP 72320 | 25.46 |
| 2026-06-08 12:00 | 14:47:22.39 | +68:39:05.1 | HIP 72320 | 25.27 |
| 2026-06-09 00:00 | 14:47:19.31 | +68:38:53.9 | HIP 72320 | 25.08 |
| 2026-06-09 12:00 | 14:47:16.24 | +68:38:42.6 | HIP 72320 | 24.90 |
| 2026-06-10 00:00 | 14:47:13.19 | +68:38:31.0 | HIP 72320 | 24.71 |
| 2026-06-10 12:00 | 14:47:10.16 | +68:38:19.4 | HIP 72320 | 24.53 |
| 2026-06-11 00:00 | 14:47:07.15 | +68:38:07.5 | HIP 72320 | 24.35 |
| 2026-06-11 12:00 | 14:47:04.16 | +68:37:55.6 | HIP 72320 | 24.16 |
| 2026-06-12 00:00 | 14:47:01.18 | +68:37:43.4 | HIP 72320 | 23.98 |
| 2026-06-12 12:00 | 14:46:58.23 | +68:37:31.1 | HIP 72320 | 23.80 |
| 2026-06-13 00:00 | 14:46:55.30 | +68:37:18.7 | HIP 72320 | 23.62 |
| 2026-06-13 12:00 | 14:46:52.39 | +68:37:06.1 | HIP 72320 | 23.44 |
| 2026-06-14 00:00 | 14:46:49.50 | +68:36:53.4 | HIP 72320 | 23.26 |
| 2026-06-14 12:00 | 14:46:46.63 | +68:36:40.5 | HIP 72320 | 23.08 |
| 2026-06-15 00:00 | 14:46:43.78 | +68:36:27.5 | HIP 72320 | 22.91 |
| 2026-06-15 12:00 | 14:46:40.95 | +68:36:14.3 | HIP 72320 | 22.73 |
| 2026-06-16 00:00 | 14:46:38.14 | +68:36:01.0 | HIP 72320 | 22.56 |
| 2026-06-16 12:00 | 14:46:35.36 | +68:35:47.6 | HIP 72320 | 22.38 |
| 2026-06-17 00:00 | 14:46:32.59 | +68:35:34.0 | HIP 72320 | 22.21 |
| 2026-06-17 12:00 | 14:46:29.85 | +68:35:20.3 | HIP 72320 | 22.04 |
| 2026-06-18 00:00 | 14:46:27.13 | +68:35:06.4 | HIP 72320 | 21.87 |
| 2026-06-18 12:00 | 14:46:24.44 | +68:34:52.4 | HIP 72320 | 21.70 |
| 2026-06-19 00:00 | 14:46:21.76 | +68:34:38.3 | HIP 72320 | 21.53 |
| 2026-06-19 12:00 | 14:46:19.11 | +68:34:24.0 | HIP 72320 | 21.37 |
| 2026-06-20 00:00 | 14:46:16.49 | +68:34:09.6 | HIP 72320 | 21.20 |
| 2026-06-20 12:00 | 14:46:13.88 | +68:33:55.0 | HIP 72320 | 21.04 |
| 2026-06-21 00:00 | 14:46:11.30 | +68:33:40.3 | HIP 72320 | 20.88 |
| 2026-06-21 12:00 | 14:46:08.74 | +68:33:25.5 | HIP 72320 | 20.72 |
| 2026-06-22 00:00 | 14:46:06.21 | +68:33:10.6 | HIP 72320 | 20.56 |