P/2021 N2 (Fuls)
Metadata
| Parameter | Value |
|---|---|
| Designation | P/2021 N2 (Fuls) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2021-11-13T08:47:40.061760Z |
| Orbit solution date (soln_date, UTC) | 2024-04-13T16:42:58Z |
| Obs used | 1068 |
| NEO | - |
| M1 | 10.700 |
| K1 | 6.000 |
| PC | - |
| Discovery observation (MPC, UTC) | 2021-07-09T10:28:20.640000Z |
| Discovery magnitude (MPC) | 18.31 G |
| Discovery observatory (MPC) | 703 · University of Arizona Catalina Sky Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-02-21.0000000 |
| e | 0.45237346 |
| q (au) | 3.796615 |
| a (au) | 6.932854 |
| i (deg) | 13.062899 |
| Ω (om, deg) | 221.742530 |
| ω (w, deg) | 177.355783 |
| M (ma, deg) | 5.379497 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.772 + 2.987\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.772 |
| n | 2.987 |
| gf | 1.000 |
| gb | -0.652 |
| 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 |
|---|---|---|---|
| 2021-11-13 | 2023-03-18 | +6.3819 | -4.257 |
| 2023-03-18 | 2024-02-14 | +33.5728 | -22.867 |
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 | 11:03:54.83 | -04:30:49.7 | HIP 54155 | 21.09 |
| 2026-06-01 12:00 | 11:03:58.00 | -04:30:20.7 | HIP 54155 | 20.25 |
| 2026-06-02 00:00 | 11:04:01.27 | -04:29:52.4 | HIP 54155 | 19.42 |
| 2026-06-02 12:00 | 11:04:04.66 | -04:29:24.8 | HIP 54155 | 18.60 |
| 2026-06-03 00:00 | 11:04:08.14 | -04:28:58.0 | HIP 54155 | 17.79 |
| 2026-06-03 12:00 | 11:04:11.74 | -04:28:31.9 | HIP 54155 | 17.00 |
| 2026-06-04 00:00 | 11:04:15.44 | -04:28:06.6 | HIP 54155 | 16.23 |
| 2026-06-04 12:00 | 11:04:19.24 | -04:27:42.0 | HIP 54155 | 15.49 |
| 2026-06-05 00:00 | 11:04:23.15 | -04:27:18.1 | HIP 54155 | 14.78 |
| 2026-06-05 12:00 | 11:04:27.16 | -04:26:55.0 | HIP 54155 | 14.13 |
| 2026-06-06 00:00 | 11:04:31.27 | -04:26:32.6 | HIP 54155 | 13.54 |
| 2026-06-06 12:00 | 11:04:35.49 | -04:26:11.0 | HIP 54155 | 13.02 |
| 2026-06-07 00:00 | 11:04:39.81 | -04:25:50.1 | HIP 54155 | 12.59 |
| 2026-06-07 12:00 | 11:04:44.24 | -04:25:29.9 | HIP 54155 | 12.27 |
| 2026-06-08 00:00 | 11:04:48.76 | -04:25:10.5 | HIP 54155 | 12.06 |
| 2026-06-08 12:00 | 11:04:53.39 | -04:24:51.8 | HIP 54155 | 11.98 |
| 2026-06-09 00:00 | 11:04:58.12 | -04:24:33.9 | HIP 54155 | 12.04 |
| 2026-06-09 12:00 | 11:05:02.95 | -04:24:16.7 | HIP 54155 | 12.25 |
| 2026-06-10 00:00 | 11:05:07.89 | -04:24:00.3 | HIP 54155 | 12.60 |
| 2026-06-10 12:00 | 11:05:12.92 | -04:23:44.6 | HIP 54155 | 13.08 |
| 2026-06-11 00:00 | 11:05:18.05 | -04:23:29.7 | HIP 54155 | 13.70 |
| 2026-06-11 12:00 | 11:05:23.29 | -04:23:15.5 | HIP 54155 | 14.43 |
| 2026-06-12 00:00 | 11:05:28.62 | -04:23:02.0 | HIP 54155 | 15.27 |
| 2026-06-12 12:00 | 11:05:34.05 | -04:22:49.3 | HIP 54155 | 16.21 |
| 2026-06-13 00:00 | 11:05:39.59 | -04:22:37.4 | HIP 54155 | 17.23 |
| 2026-06-13 12:00 | 11:05:45.22 | -04:22:26.2 | HIP 54155 | 18.33 |
| 2026-06-14 00:00 | 11:05:50.95 | -04:22:15.7 | HIP 54155 | 19.50 |
| 2026-06-14 12:00 | 11:05:56.77 | -04:22:06.0 | HIP 54155 | 20.73 |
| 2026-06-15 00:00 | 11:06:02.70 | -04:21:57.0 | HIP 54155 | 22.01 |
| 2026-06-15 12:00 | 11:06:08.72 | -04:21:48.7 | HIP 54155 | 23.35 |
| 2026-06-16 00:00 | 11:06:14.83 | -04:21:41.2 | HIP 54155 | 24.73 |
| 2026-06-16 12:00 | 11:06:21.05 | -04:21:34.5 | HIP 54155 | 26.16 |
| 2026-06-17 00:00 | 11:06:27.36 | -04:21:28.5 | HIP 54155 | 27.62 |
| 2026-06-17 12:00 | 11:06:33.76 | -04:21:23.2 | HIP 54155 | 29.13 |
| 2026-06-18 00:00 | 11:06:40.26 | -04:21:18.7 | HIP 54155 | 30.67 |
| 2026-06-18 12:00 | 11:06:46.85 | -04:21:14.9 | HIP 54155 | 32.24 |
| 2026-06-19 00:00 | 11:06:53.53 | -04:21:11.8 | HIP 54155 | 33.84 |
| 2026-06-19 12:00 | 11:07:00.31 | -04:21:09.5 | HIP 54435 | 33.55 |
| 2026-06-20 00:00 | 11:07:07.18 | -04:21:07.9 | HIP 54435 | 32.56 |
| 2026-06-20 12:00 | 11:07:14.14 | -04:21:07.0 | HIP 54435 | 31.64 |
| 2026-06-21 00:00 | 11:07:21.20 | -04:21:06.8 | HIP 54435 | 30.79 |
| 2026-06-21 12:00 | 11:07:28.34 | -04:21:07.4 | HIP 54435 | 30.02 |
| 2026-06-22 00:00 | 11:07:35.57 | -04:21:08.7 | HIP 54513 | 28.56 |