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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 14:46:12.03 | +67:35:16.7 | HIP 72129 | 17.03 |
| 2026-09-20 12:00 | 14:46:14.55 | +67:35:00.7 | HIP 72129 | 17.35 |
| 2026-09-21 00:00 | 14:46:17.08 | +67:34:44.9 | HIP 72129 | 17.68 |
| 2026-09-21 12:00 | 14:46:19.64 | +67:34:29.2 | HIP 72129 | 18.01 |
| 2026-09-22 00:00 | 14:46:22.22 | +67:34:13.6 | HIP 72129 | 18.34 |
| 2026-09-22 12:00 | 14:46:24.82 | +67:33:58.2 | HIP 72129 | 18.66 |
| 2026-09-23 00:00 | 14:46:27.44 | +67:33:42.8 | HIP 72129 | 18.99 |
| 2026-09-23 12:00 | 14:46:30.08 | +67:33:27.6 | HIP 72129 | 19.31 |
| 2026-09-24 00:00 | 14:46:32.74 | +67:33:12.5 | HIP 72129 | 19.64 |
| 2026-09-24 12:00 | 14:46:35.42 | +67:32:57.5 | HIP 72129 | 19.97 |
| 2026-09-25 00:00 | 14:46:38.12 | +67:32:42.7 | HIP 72129 | 20.29 |
| 2026-09-25 12:00 | 14:46:40.84 | +67:32:28.0 | HIP 72129 | 20.62 |
| 2026-09-26 00:00 | 14:46:43.57 | +67:32:13.4 | HIP 72129 | 20.94 |
| 2026-09-26 12:00 | 14:46:46.33 | +67:31:58.9 | HIP 72129 | 21.27 |
| 2026-09-27 00:00 | 14:46:49.11 | +67:31:44.6 | HIP 72129 | 21.59 |
| 2026-09-27 12:00 | 14:46:51.90 | +67:31:30.4 | HIP 72129 | 21.92 |
| 2026-09-28 00:00 | 14:46:54.72 | +67:31:16.4 | HIP 72129 | 22.24 |
| 2026-09-28 12:00 | 14:46:57.55 | +67:31:02.4 | HIP 72129 | 22.57 |
| 2026-09-29 00:00 | 14:47:00.40 | +67:30:48.6 | HIP 72129 | 22.89 |
| 2026-09-29 12:00 | 14:47:03.27 | +67:30:35.0 | HIP 72129 | 23.22 |
| 2026-09-30 00:00 | 14:47:06.16 | +67:30:21.4 | HIP 72129 | 23.54 |
| 2026-09-30 12:00 | 14:47:09.07 | +67:30:08.1 | HIP 72129 | 23.86 |
| 2026-10-01 00:00 | 14:47:11.99 | +67:29:54.8 | HIP 72625 | 24.04 |
| 2026-10-01 12:00 | 14:47:14.93 | +67:29:41.7 | HIP 72625 | 23.69 |
| 2026-10-02 00:00 | 14:47:17.89 | +67:29:28.7 | HIP 72625 | 23.34 |
| 2026-10-02 12:00 | 14:47:20.86 | +67:29:15.9 | HIP 72625 | 22.99 |
| 2026-10-03 00:00 | 14:47:23.86 | +67:29:03.2 | HIP 72625 | 22.64 |
| 2026-10-03 12:00 | 14:47:26.87 | +67:28:50.6 | HIP 72625 | 22.29 |
| 2026-10-04 00:00 | 14:47:29.89 | +67:28:38.2 | HIP 72625 | 21.94 |
| 2026-10-04 12:00 | 14:47:32.93 | +67:28:26.0 | HIP 72625 | 21.59 |
| 2026-10-05 00:00 | 14:47:35.99 | +67:28:13.9 | HIP 72625 | 21.24 |
| 2026-10-05 12:00 | 14:47:39.07 | +67:28:01.9 | HIP 72625 | 20.89 |
| 2026-10-06 00:00 | 14:47:42.16 | +67:27:50.1 | HIP 72625 | 20.53 |
| 2026-10-06 12:00 | 14:47:45.26 | +67:27:38.4 | HIP 72625 | 20.18 |
| 2026-10-07 00:00 | 14:47:48.38 | +67:27:26.9 | HIP 72625 | 19.83 |
| 2026-10-07 12:00 | 14:47:51.52 | +67:27:15.5 | HIP 72625 | 19.48 |
| 2026-10-08 00:00 | 14:47:54.67 | +67:27:04.3 | HIP 72625 | 19.13 |
| 2026-10-08 12:00 | 14:47:57.84 | +67:26:53.2 | HIP 72625 | 18.77 |
| 2026-10-09 00:00 | 14:48:01.02 | +67:26:42.3 | HIP 72625 | 18.42 |
| 2026-10-09 12:00 | 14:48:04.21 | +67:26:31.5 | HIP 72625 | 18.07 |
| 2026-10-10 00:00 | 14:48:07.42 | +67:26:20.9 | HIP 72625 | 17.72 |
| 2026-10-10 12:00 | 14:48:10.65 | +67:26:10.5 | HIP 72625 | 17.36 |
| 2026-10-11 00:00 | 14:48:13.88 | +67:26:00.2 | HIP 72625 | 17.01 |