285P/LINEAR
Metadata
| Parameter | Value |
|---|---|
| Designation | 285P/LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-01-12T20:28:47.072640Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:48Z |
| Obs used | 933 |
| NEO | - |
| M1 | 13.600 |
| K1 | 4.500 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-02-29.0000000 |
| e | 0.61787770 |
| q (au) | 1.723017 |
| a (au) | 4.509072 |
| i (deg) | 25.023386 |
| Ω (om, deg) | 185.483345 |
| ω (w, deg) | 178.401291 |
| M (ma, deg) | 252.033734 |
Magnitude
Scatter + Global Linear
$$ M_a = (15.549 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 15.549 |
| n | 2.000 |
| gf | 1.000 |
| gb | -1.000 |
| k | 0.800 |
| δ90 | 10.000 |
| 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 |
|---|---|---|---|
| 2022-06-28 | 2022-08-13 | +85.0046 | -30.978 |
| 2022-08-13 | 2023-01-09 | -1.4071 | +0.571 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 10:36:09.04 | +00:34:46.2 | HIP 51895 | 6.39 |
| 2026-06-01 12:00 | 10:36:14.23 | +00:35:18.5 | HIP 51895 | 5.98 |
| 2026-06-02 00:00 | 10:36:19.54 | +00:35:50.0 | HIP 51895 | 5.92 |
| 2026-06-02 12:00 | 10:36:24.98 | +00:36:20.6 | HIP 51895 | 6.23 |
| 2026-06-03 00:00 | 10:36:30.53 | +00:36:50.2 | HIP 51895 | 6.87 |
| 2026-06-03 12:00 | 10:36:36.20 | +00:37:19.0 | HIP 51895 | 7.77 |
| 2026-06-04 00:00 | 10:36:42.00 | +00:37:46.9 | HIP 51895 | 8.87 |
| 2026-06-04 12:00 | 10:36:47.90 | +00:38:13.9 | HIP 51895 | 10.11 |
| 2026-06-05 00:00 | 10:36:53.93 | +00:38:40.0 | HIP 51895 | 11.46 |
| 2026-06-05 12:00 | 10:37:00.07 | +00:39:05.2 | HIP 51895 | 12.89 |
| 2026-06-06 00:00 | 10:37:06.33 | +00:39:29.5 | HIP 51895 | 14.38 |
| 2026-06-06 12:00 | 10:37:12.70 | +00:39:52.9 | HIP 51895 | 15.93 |
| 2026-06-07 00:00 | 10:37:19.19 | +00:40:15.4 | HIP 51895 | 17.52 |
| 2026-06-07 12:00 | 10:37:25.80 | +00:40:37.1 | HIP 51895 | 19.16 |
| 2026-06-08 00:00 | 10:37:32.52 | +00:40:57.9 | HIP 51895 | 20.83 |
| 2026-06-08 12:00 | 10:37:39.35 | +00:41:17.8 | HIP 51895 | 22.54 |
| 2026-06-09 00:00 | 10:37:46.29 | +00:41:36.8 | HIP 51895 | 24.28 |
| 2026-06-09 12:00 | 10:37:53.35 | +00:41:54.9 | HIP 51895 | 26.05 |
| 2026-06-10 00:00 | 10:38:00.52 | +00:42:12.2 | HIP 51895 | 27.85 |
| 2026-06-10 12:00 | 10:38:07.80 | +00:42:28.6 | HIP 51895 | 29.68 |
| 2026-06-11 00:00 | 10:38:15.19 | +00:42:44.1 | HIP 51895 | 31.54 |
| 2026-06-11 12:00 | 10:38:22.69 | +00:42:58.7 | HIP 52058 | 31.69 |
| 2026-06-12 00:00 | 10:38:30.30 | +00:43:12.5 | HIP 52058 | 31.60 |
| 2026-06-12 12:00 | 10:38:38.02 | +00:43:25.4 | HIP 52058 | 31.65 |
| 2026-06-13 00:00 | 10:38:45.85 | +00:43:37.4 | HIP 52058 | 31.83 |
| 2026-06-13 12:00 | 10:38:53.79 | +00:43:48.6 | HIP 52267 | 31.39 |
| 2026-06-14 00:00 | 10:39:01.83 | +00:43:58.9 | HIP 52267 | 29.65 |
| 2026-06-14 12:00 | 10:39:09.98 | +00:44:08.4 | HIP 52267 | 27.92 |
| 2026-06-15 00:00 | 10:39:18.24 | +00:44:17.0 | HIP 52267 | 26.21 |
| 2026-06-15 12:00 | 10:39:26.60 | +00:44:24.7 | HIP 52267 | 24.52 |
| 2026-06-16 00:00 | 10:39:35.07 | +00:44:31.6 | HIP 52267 | 22.88 |
| 2026-06-16 12:00 | 10:39:43.64 | +00:44:37.6 | HIP 52267 | 21.28 |
| 2026-06-17 00:00 | 10:39:52.32 | +00:44:42.8 | HIP 52267 | 19.76 |
| 2026-06-17 12:00 | 10:40:01.10 | +00:44:47.2 | HIP 52267 | 18.35 |
| 2026-06-18 00:00 | 10:40:09.97 | +00:44:50.7 | HIP 52267 | 17.08 |
| 2026-06-18 12:00 | 10:40:18.95 | +00:44:53.4 | HIP 52267 | 15.99 |
| 2026-06-19 00:00 | 10:40:28.04 | +00:44:55.2 | HIP 52267 | 15.13 |
| 2026-06-19 12:00 | 10:40:37.22 | +00:44:56.3 | HIP 52267 | 14.57 |
| 2026-06-20 00:00 | 10:40:46.50 | +00:44:56.5 | HIP 52267 | 14.34 |
| 2026-06-20 12:00 | 10:40:55.87 | +00:44:55.8 | HIP 52267 | 14.47 |
| 2026-06-21 00:00 | 10:41:05.35 | +00:44:54.4 | HIP 52267 | 14.97 |
| 2026-06-21 12:00 | 10:41:14.92 | +00:44:52.2 | HIP 52267 | 15.80 |
| 2026-06-22 00:00 | 10:41:24.59 | +00:44:49.1 | HIP 52377 | 15.89 |