P/2011 N1 (ASH)
Metadata
| Parameter | Value |
|---|---|
| Designation | P/2011 N1 (ASH) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2012-05-31T06:52:34.999680Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:31:52Z |
| Obs used | 269 |
| NEO | - |
| M1 | 12.800 |
| K1 | 5.250 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2011-12-30.0000000 |
| e | 0.54594610 |
| q (au) | 2.857717 |
| a (au) | 6.293785 |
| i (deg) | 35.668884 |
| Ω (om, deg) | 77.690510 |
| ω (w, deg) | 331.056188 |
| M (ma, deg) | 350.431581 |
Magnitude
Scatter + Global Linear
$$ M_a = (12.378 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 12.378 |
| n | 2.000 |
| gf | 0.999 |
| gb | -0.500 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2011-07-01 | 2012-02-01 | +4.8034 | -2.824 |
| 2012-09-29 | 2014-03-21 | -1.2040 | +2.406 |
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 | 22:00:59.54 | -44:46:05.8 | HIP 108665 | 18.38 |
| 2026-06-01 12:00 | 22:01:10.60 | -44:49:43.0 | HIP 108665 | 22.19 |
| 2026-06-02 00:00 | 22:01:21.44 | -44:53:21.4 | HIP 108665 | 26.11 |
| 2026-06-02 12:00 | 22:01:32.04 | -44:57:01.2 | HIP 108665 | 30.10 |
| 2026-06-03 00:00 | 22:01:42.42 | -45:00:42.3 | HIP 108665 | 34.12 |
| 2026-06-03 12:00 | 22:01:52.56 | -45:04:24.6 | HIP 108665 | 38.18 |
| 2026-06-04 00:00 | 22:02:02.47 | -45:08:08.2 | HIP 108987 | 35.71 |
| 2026-06-04 12:00 | 22:02:12.14 | -45:11:53.1 | HIP 108987 | 32.16 |
| 2026-06-05 00:00 | 22:02:21.58 | -45:15:39.3 | HIP 108987 | 28.79 |
| 2026-06-05 12:00 | 22:02:30.78 | -45:19:26.7 | HIP 108987 | 25.67 |
| 2026-06-06 00:00 | 22:02:39.73 | -45:23:15.3 | HIP 108987 | 22.92 |
| 2026-06-06 12:00 | 22:02:48.45 | -45:27:05.1 | HIP 108987 | 20.66 |
| 2026-06-07 00:00 | 22:02:56.92 | -45:30:56.2 | HIP 108987 | 19.09 |
| 2026-06-07 12:00 | 22:03:05.15 | -45:34:48.5 | HIP 108987 | 18.39 |
| 2026-06-08 00:00 | 22:03:13.13 | -45:38:42.0 | HIP 108994 | 17.99 |
| 2026-06-08 12:00 | 22:03:20.86 | -45:42:36.6 | HIP 108994 | 15.59 |
| 2026-06-09 00:00 | 22:03:28.34 | -45:46:32.4 | HIP 108994 | 14.08 |
| 2026-06-09 12:00 | 22:03:35.56 | -45:50:29.4 | HIP 108994 | 13.75 |
| 2026-06-10 00:00 | 22:03:42.54 | -45:54:27.5 | HIP 108899 | 13.27 |
| 2026-06-10 12:00 | 22:03:49.26 | -45:58:26.7 | HIP 108899 | 9.57 |
| 2026-06-11 00:00 | 22:03:55.72 | -46:02:27.1 | HIP 108899 | 6.41 |
| 2026-06-11 12:00 | 22:04:01.92 | -46:06:28.5 | HIP 108899 | 4.96 |
| 2026-06-12 00:00 | 22:04:07.86 | -46:10:31.0 | HIP 108899 | 6.51 |
| 2026-06-12 12:00 | 22:04:13.54 | -46:14:34.6 | HIP 108899 | 9.72 |
| 2026-06-13 00:00 | 22:04:18.96 | -46:18:39.2 | HIP 108899 | 13.46 |
| 2026-06-13 12:00 | 22:04:24.11 | -46:22:44.8 | HIP 108899 | 17.40 |
| 2026-06-14 00:00 | 22:04:29.00 | -46:26:51.4 | HIP 108899 | 21.42 |
| 2026-06-14 12:00 | 22:04:33.62 | -46:30:59.0 | HIP 108899 | 25.49 |
| 2026-06-15 00:00 | 22:04:37.96 | -46:35:07.6 | HIP 108899 | 29.60 |
| 2026-06-15 12:00 | 22:04:42.04 | -46:39:17.1 | HIP 108760 | 33.18 |
| 2026-06-16 00:00 | 22:04:45.85 | -46:43:27.5 | HIP 108792 | 35.51 |
| 2026-06-16 12:00 | 22:04:49.38 | -46:47:38.8 | HIP 108792 | 33.11 |
| 2026-06-17 00:00 | 22:04:52.64 | -46:51:51.0 | HIP 108792 | 31.05 |
| 2026-06-17 12:00 | 22:04:55.62 | -46:56:04.0 | HIP 108792 | 29.42 |
| 2026-06-18 00:00 | 22:04:58.33 | -47:00:17.9 | HIP 108792 | 28.28 |
| 2026-06-18 12:00 | 22:05:00.76 | -47:04:32.6 | HIP 108792 | 27.70 |
| 2026-06-19 00:00 | 22:05:02.91 | -47:08:48.0 | HIP 108937 | 26.10 |
| 2026-06-19 12:00 | 22:05:04.78 | -47:13:04.3 | HIP 108937 | 22.25 |
| 2026-06-20 00:00 | 22:05:06.37 | -47:17:21.2 | HIP 108937 | 18.55 |
| 2026-06-20 12:00 | 22:05:07.68 | -47:21:38.9 | HIP 108937 | 15.12 |
| 2026-06-21 00:00 | 22:05:08.71 | -47:25:57.2 | HIP 108937 | 12.20 |
| 2026-06-21 12:00 | 22:05:09.45 | -47:30:16.2 | HIP 108937 | 10.27 |
| 2026-06-22 00:00 | 22:05:09.91 | -47:34:35.9 | HIP 108937 | 9.92 |