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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 14:55:58.81 | +68:34:03.9 | HIP 72922 | 15.75 |
| 2026-03-26 12:00 | 14:55:56.02 | +68:34:18.7 | HIP 72922 | 15.40 |
| 2026-03-27 00:00 | 14:55:53.20 | +68:34:33.3 | HIP 72922 | 15.05 |
| 2026-03-27 12:00 | 14:55:50.36 | +68:34:47.8 | HIP 72922 | 14.70 |
| 2026-03-28 00:00 | 14:55:47.50 | +68:35:02.1 | HIP 72922 | 14.35 |
| 2026-03-28 12:00 | 14:55:44.62 | +68:35:16.3 | HIP 72922 | 14.00 |
| 2026-03-29 00:00 | 14:55:41.72 | +68:35:30.3 | HIP 72922 | 13.65 |
| 2026-03-29 12:00 | 14:55:38.79 | +68:35:44.2 | HIP 72922 | 13.31 |
| 2026-03-30 00:00 | 14:55:35.85 | +68:35:58.0 | HIP 72922 | 12.96 |
| 2026-03-30 12:00 | 14:55:32.88 | +68:36:11.6 | HIP 72922 | 12.62 |
| 2026-03-31 00:00 | 14:55:29.89 | +68:36:25.0 | HIP 72922 | 12.28 |
| 2026-03-31 12:00 | 14:55:26.89 | +68:36:38.3 | HIP 72922 | 11.94 |
| 2026-04-01 00:00 | 14:55:23.86 | +68:36:51.5 | HIP 72922 | 11.61 |
| 2026-04-01 12:00 | 14:55:20.81 | +68:37:04.4 | HIP 72922 | 11.27 |
| 2026-04-02 00:00 | 14:55:17.75 | +68:37:17.3 | HIP 72922 | 10.94 |
| 2026-04-02 12:00 | 14:55:14.67 | +68:37:30.0 | HIP 72922 | 10.61 |
| 2026-04-03 00:00 | 14:55:11.56 | +68:37:42.5 | HIP 72922 | 10.28 |
| 2026-04-03 12:00 | 14:55:08.44 | +68:37:54.8 | HIP 72922 | 9.96 |
| 2026-04-04 00:00 | 14:55:05.30 | +68:38:07.1 | HIP 72922 | 9.63 |
| 2026-04-04 12:00 | 14:55:02.14 | +68:38:19.1 | HIP 72922 | 9.32 |
| 2026-04-05 00:00 | 14:54:58.96 | +68:38:31.0 | HIP 72922 | 9.00 |
| 2026-04-05 12:00 | 14:54:55.77 | +68:38:42.7 | HIP 72922 | 8.69 |
| 2026-04-06 00:00 | 14:54:52.56 | +68:38:54.3 | HIP 72922 | 8.39 |
| 2026-04-06 12:00 | 14:54:49.33 | +68:39:05.7 | HIP 72922 | 8.09 |
| 2026-04-07 00:00 | 14:54:46.08 | +68:39:16.9 | HIP 72922 | 7.80 |
| 2026-04-07 12:00 | 14:54:42.82 | +68:39:28.0 | HIP 72922 | 7.51 |
| 2026-04-08 00:00 | 14:54:39.54 | +68:39:38.9 | HIP 72922 | 7.23 |
| 2026-04-08 12:00 | 14:54:36.24 | +68:39:49.7 | HIP 72922 | 6.96 |
| 2026-04-09 00:00 | 14:54:32.93 | +68:40:00.3 | HIP 72922 | 6.70 |
| 2026-04-09 12:00 | 14:54:29.60 | +68:40:10.7 | HIP 72922 | 6.45 |
| 2026-04-10 00:00 | 14:54:26.26 | +68:40:20.9 | HIP 72922 | 6.21 |
| 2026-04-10 12:00 | 14:54:22.90 | +68:40:31.0 | HIP 72922 | 5.99 |
| 2026-04-11 00:00 | 14:54:19.53 | +68:40:40.9 | HIP 72922 | 5.78 |
| 2026-04-11 12:00 | 14:54:16.14 | +68:40:50.7 | HIP 72922 | 5.59 |
| 2026-04-12 00:00 | 14:54:12.74 | +68:41:00.2 | HIP 72922 | 5.41 |
| 2026-04-12 12:00 | 14:54:09.32 | +68:41:09.6 | HIP 72922 | 5.26 |
| 2026-04-13 00:00 | 14:54:05.89 | +68:41:18.8 | HIP 72922 | 5.12 |
| 2026-04-13 12:00 | 14:54:02.45 | +68:41:27.9 | HIP 72922 | 5.01 |
| 2026-04-14 00:00 | 14:53:58.99 | +68:41:36.8 | HIP 72922 | 4.93 |
| 2026-04-14 12:00 | 14:53:55.52 | +68:41:45.5 | HIP 72922 | 4.87 |
| 2026-04-15 00:00 | 14:53:52.04 | +68:41:54.0 | HIP 72922 | 4.84 |
| 2026-04-15 12:00 | 14:53:48.54 | +68:42:02.3 | HIP 72922 | 4.84 |
| 2026-04-16 00:00 | 14:53:45.03 | +68:42:10.5 | HIP 72922 | 4.86 |