C/1982 M1 (Austin)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/1982 M1 (Austin) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1982-08-24T17:30:18.077760Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:29Z |
| Obs used | 290 |
| NEO | - |
| M1 | 9.000 |
| K1 | 15.250 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 1982-09-05.0000000 |
| e | 0.99939617 |
| q (au) | 0.647812 |
| a (au) | 1072.840846 |
| i (deg) | 84.494983 |
| Ω (om, deg) | 326.262542 |
| ω (w, deg) | 33.822836 |
| M (ma, deg) | 0.000316 |
Magnitude
Scatter + Global Linear
$$ M_a = (7.940 + 3.398\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 7.940 |
| n | 3.398 |
| gf | 0.800 |
| gb | -0.593 |
| 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 |
|---|---|---|---|
| 1982-06-18 | 1982-07-10 | +7.1779 | -0.282 |
| 1982-07-10 | 1982-08-06 | -6.0580 | -0.022 |
| 1982-08-06 | 1982-08-24 | +9.1335 | +2.617 |
| 1982-08-24 | 1982-09-21 | -3.7033 | -0.749 |
| 1982-09-21 | 1982-11-21 | +3.7455 | -0.223 |
| 1982-11-21 | 1983-04-02 | +12.0937 | -2.471 |
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 | 09:28:30.22 | -09:08:47.1 | HIP 46450 | 3.23 |
| 2026-05-12 12:00 | 09:28:30.24 | -09:08:37.2 | HIP 46450 | 3.39 |
| 2026-05-13 00:00 | 09:28:30.27 | -09:08:27.4 | HIP 46450 | 3.55 |
| 2026-05-13 12:00 | 09:28:30.32 | -09:08:17.6 | HIP 46450 | 3.70 |
| 2026-05-14 00:00 | 09:28:30.37 | -09:08:07.9 | HIP 46450 | 3.86 |
| 2026-05-14 12:00 | 09:28:30.45 | -09:07:58.2 | HIP 46450 | 4.02 |
| 2026-05-15 00:00 | 09:28:30.53 | -09:07:48.7 | HIP 46450 | 4.18 |
| 2026-05-15 12:00 | 09:28:30.64 | -09:07:39.2 | HIP 46450 | 4.34 |
| 2026-05-16 00:00 | 09:28:30.75 | -09:07:29.8 | HIP 46450 | 4.50 |
| 2026-05-16 12:00 | 09:28:30.88 | -09:07:20.4 | HIP 46450 | 4.65 |
| 2026-05-17 00:00 | 09:28:31.02 | -09:07:11.1 | HIP 46450 | 4.81 |
| 2026-05-17 12:00 | 09:28:31.18 | -09:07:01.9 | HIP 46450 | 4.97 |
| 2026-05-18 00:00 | 09:28:31.35 | -09:06:52.8 | HIP 46450 | 5.13 |
| 2026-05-18 12:00 | 09:28:31.53 | -09:06:43.8 | HIP 46450 | 5.29 |
| 2026-05-19 00:00 | 09:28:31.73 | -09:06:34.8 | HIP 46450 | 5.44 |
| 2026-05-19 12:00 | 09:28:31.95 | -09:06:25.9 | HIP 46450 | 5.60 |
| 2026-05-20 00:00 | 09:28:32.17 | -09:06:17.1 | HIP 46450 | 5.76 |
| 2026-05-20 12:00 | 09:28:32.41 | -09:06:08.3 | HIP 46450 | 5.91 |
| 2026-05-21 00:00 | 09:28:32.66 | -09:05:59.7 | HIP 46450 | 6.07 |
| 2026-05-21 12:00 | 09:28:32.93 | -09:05:51.1 | HIP 46450 | 6.23 |
| 2026-05-22 00:00 | 09:28:33.21 | -09:05:42.6 | HIP 46450 | 6.38 |
| 2026-05-22 12:00 | 09:28:33.51 | -09:05:34.2 | HIP 46450 | 6.54 |
| 2026-05-23 00:00 | 09:28:33.81 | -09:05:25.8 | HIP 46450 | 6.69 |
| 2026-05-23 12:00 | 09:28:34.13 | -09:05:17.6 | HIP 46450 | 6.85 |
| 2026-05-24 00:00 | 09:28:34.47 | -09:05:09.4 | HIP 46450 | 7.00 |
| 2026-05-24 12:00 | 09:28:34.82 | -09:05:01.3 | HIP 46450 | 7.16 |
| 2026-05-25 00:00 | 09:28:35.18 | -09:04:53.3 | HIP 46450 | 7.31 |
| 2026-05-25 12:00 | 09:28:35.55 | -09:04:45.3 | HIP 46450 | 7.47 |
| 2026-05-26 00:00 | 09:28:35.94 | -09:04:37.5 | HIP 46450 | 7.63 |
| 2026-05-26 12:00 | 09:28:36.34 | -09:04:29.7 | HIP 46450 | 7.78 |
| 2026-05-27 00:00 | 09:28:36.76 | -09:04:22.1 | HIP 46450 | 7.94 |
| 2026-05-27 12:00 | 09:28:37.18 | -09:04:14.5 | HIP 46450 | 8.09 |
| 2026-05-28 00:00 | 09:28:37.62 | -09:04:07.0 | HIP 46450 | 8.25 |
| 2026-05-28 12:00 | 09:28:38.08 | -09:03:59.5 | HIP 46450 | 8.40 |
| 2026-05-29 00:00 | 09:28:38.54 | -09:03:52.2 | HIP 46450 | 8.56 |
| 2026-05-29 12:00 | 09:28:39.02 | -09:03:45.0 | HIP 46450 | 8.72 |
| 2026-05-30 00:00 | 09:28:39.51 | -09:03:37.8 | HIP 46450 | 8.87 |
| 2026-05-30 12:00 | 09:28:40.02 | -09:03:30.7 | HIP 46450 | 9.03 |
| 2026-05-31 00:00 | 09:28:40.54 | -09:03:23.8 | HIP 46450 | 9.19 |
| 2026-05-31 12:00 | 09:28:41.07 | -09:03:16.9 | HIP 46450 | 9.35 |
| 2026-06-01 00:00 | 09:28:41.61 | -09:03:10.1 | HIP 46450 | 9.51 |
| 2026-06-01 12:00 | 09:28:42.17 | -09:03:03.3 | HIP 46450 | 9.67 |
| 2026-06-02 00:00 | 09:28:42.74 | -09:02:56.7 | HIP 46450 | 9.83 |