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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 14:44:13.67 | +68:10:14.4 | HIP 72320 | 17.79 |
| 2026-07-29 12:00 | 14:44:13.25 | +68:09:53.4 | HIP 72320 | 17.90 |
| 2026-07-30 00:00 | 14:44:12.86 | +68:09:32.4 | HIP 72320 | 18.02 |
| 2026-07-30 12:00 | 14:44:12.50 | +68:09:11.4 | HIP 72320 | 18.14 |
| 2026-07-31 00:00 | 14:44:12.18 | +68:08:50.4 | HIP 72320 | 18.27 |
| 2026-07-31 12:00 | 14:44:11.88 | +68:08:29.3 | HIP 72129 | 18.06 |
| 2026-08-01 00:00 | 14:44:11.61 | +68:08:08.2 | HIP 72129 | 17.74 |
| 2026-08-01 12:00 | 14:44:11.38 | +68:07:47.1 | HIP 72129 | 17.42 |
| 2026-08-02 00:00 | 14:44:11.17 | +68:07:25.9 | HIP 72129 | 17.09 |
| 2026-08-02 12:00 | 14:44:11.00 | +68:07:04.8 | HIP 72129 | 16.77 |
| 2026-08-03 00:00 | 14:44:10.85 | +68:06:43.6 | HIP 72129 | 16.45 |
| 2026-08-03 12:00 | 14:44:10.74 | +68:06:22.4 | HIP 72129 | 16.13 |
| 2026-08-04 00:00 | 14:44:10.66 | +68:06:01.2 | HIP 72129 | 15.80 |
| 2026-08-04 12:00 | 14:44:10.60 | +68:05:40.0 | HIP 72129 | 15.48 |
| 2026-08-05 00:00 | 14:44:10.58 | +68:05:18.8 | HIP 72129 | 15.16 |
| 2026-08-05 12:00 | 14:44:10.59 | +68:04:57.5 | HIP 72129 | 14.84 |
| 2026-08-06 00:00 | 14:44:10.63 | +68:04:36.3 | HIP 72129 | 14.52 |
| 2026-08-06 12:00 | 14:44:10.70 | +68:04:15.0 | HIP 72129 | 14.19 |
| 2026-08-07 00:00 | 14:44:10.80 | +68:03:53.8 | HIP 72129 | 13.87 |
| 2026-08-07 12:00 | 14:44:10.93 | +68:03:32.5 | HIP 72129 | 13.55 |
| 2026-08-08 00:00 | 14:44:11.09 | +68:03:11.3 | HIP 72129 | 13.23 |
| 2026-08-08 12:00 | 14:44:11.29 | +68:02:50.0 | HIP 72129 | 12.91 |
| 2026-08-09 00:00 | 14:44:11.51 | +68:02:28.7 | HIP 72129 | 12.59 |
| 2026-08-09 12:00 | 14:44:11.76 | +68:02:07.5 | HIP 72129 | 12.27 |
| 2026-08-10 00:00 | 14:44:12.05 | +68:01:46.2 | HIP 72129 | 11.95 |
| 2026-08-10 12:00 | 14:44:12.36 | +68:01:25.0 | HIP 72129 | 11.63 |
| 2026-08-11 00:00 | 14:44:12.71 | +68:01:03.7 | HIP 72129 | 11.31 |
| 2026-08-11 12:00 | 14:44:13.08 | +68:00:42.5 | HIP 72129 | 11.00 |
| 2026-08-12 00:00 | 14:44:13.49 | +68:00:21.3 | HIP 72129 | 10.68 |
| 2026-08-12 12:00 | 14:44:13.93 | +68:00:00.1 | HIP 72129 | 10.36 |
| 2026-08-13 00:00 | 14:44:14.39 | +67:59:38.9 | HIP 72129 | 10.05 |
| 2026-08-13 12:00 | 14:44:14.89 | +67:59:17.7 | HIP 72129 | 9.74 |
| 2026-08-14 00:00 | 14:44:15.42 | +67:58:56.5 | HIP 72129 | 9.43 |
| 2026-08-14 12:00 | 14:44:15.97 | +67:58:35.4 | HIP 72129 | 9.12 |
| 2026-08-15 00:00 | 14:44:16.56 | +67:58:14.3 | HIP 72129 | 8.81 |
| 2026-08-15 12:00 | 14:44:17.18 | +67:57:53.2 | HIP 72129 | 8.51 |
| 2026-08-16 00:00 | 14:44:17.83 | +67:57:32.1 | HIP 72129 | 8.20 |
| 2026-08-16 12:00 | 14:44:18.51 | +67:57:11.0 | HIP 72129 | 7.91 |
| 2026-08-17 00:00 | 14:44:19.21 | +67:56:50.0 | HIP 72129 | 7.61 |
| 2026-08-17 12:00 | 14:44:19.95 | +67:56:29.0 | HIP 72129 | 7.32 |
| 2026-08-18 00:00 | 14:44:20.72 | +67:56:08.0 | HIP 72129 | 7.03 |
| 2026-08-18 12:00 | 14:44:21.51 | +67:55:47.1 | HIP 72129 | 6.75 |
| 2026-08-19 00:00 | 14:44:22.34 | +67:55:26.2 | HIP 72129 | 6.47 |