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 · 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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 11:13:01.18 | -07:04:10.5 | HIP 54791 | 11.44 |
| 2026-03-26 12:00 | 11:12:51.15 | -07:02:42.1 | HIP 54791 | 13.17 |
| 2026-03-27 00:00 | 11:12:41.18 | -07:01:13.6 | HIP 54791 | 15.25 |
| 2026-03-27 12:00 | 11:12:31.25 | -06:59:45.1 | HIP 54791 | 17.56 |
| 2026-03-28 00:00 | 11:12:21.38 | -06:58:16.4 | HIP 54791 | 20.01 |
| 2026-03-28 12:00 | 11:12:11.57 | -06:56:47.7 | HIP 54791 | 22.54 |
| 2026-03-29 00:00 | 11:12:01.81 | -06:55:18.9 | HIP 54791 | 25.14 |
| 2026-03-29 12:00 | 11:11:52.11 | -06:53:50.0 | HIP 54589 | 26.41 |
| 2026-03-30 00:00 | 11:11:42.47 | -06:52:21.1 | HIP 54589 | 23.60 |
| 2026-03-30 12:00 | 11:11:32.90 | -06:50:52.2 | HIP 54589 | 20.81 |
| 2026-03-31 00:00 | 11:11:23.38 | -06:49:23.2 | HIP 54589 | 18.03 |
| 2026-03-31 12:00 | 11:11:13.93 | -06:47:54.3 | HIP 54589 | 15.27 |
| 2026-04-01 00:00 | 11:11:04.54 | -06:46:25.3 | HIP 54589 | 12.53 |
| 2026-04-01 12:00 | 11:10:55.21 | -06:44:56.4 | HIP 54589 | 9.83 |
| 2026-04-02 00:00 | 11:10:45.95 | -06:43:27.5 | HIP 54589 | 7.16 |
| 2026-04-02 12:00 | 11:10:36.76 | -06:41:58.6 | HIP 54589 | 4.60 |
| 2026-04-03 00:00 | 11:10:27.64 | -06:40:29.8 | HIP 54589 | 2.44 |
| 2026-04-03 12:00 | 11:10:18.59 | -06:39:01.0 | HIP 54589 | 2.31 |
| 2026-04-04 00:00 | 11:10:09.61 | -06:37:32.2 | HIP 54589 | 4.37 |
| 2026-04-04 12:00 | 11:10:00.70 | -06:36:03.6 | HIP 54589 | 6.86 |
| 2026-04-05 00:00 | 11:09:51.86 | -06:34:35.0 | HIP 54589 | 9.43 |
| 2026-04-05 12:00 | 11:09:43.10 | -06:33:06.5 | HIP 54589 | 12.02 |
| 2026-04-06 00:00 | 11:09:34.41 | -06:31:38.1 | HIP 54589 | 14.61 |
| 2026-04-06 12:00 | 11:09:25.80 | -06:30:09.9 | HIP 54458 | 14.40 |
| 2026-04-07 00:00 | 11:09:17.26 | -06:28:41.7 | HIP 54458 | 11.91 |
| 2026-04-07 12:00 | 11:09:08.81 | -06:27:13.7 | HIP 54458 | 9.50 |
| 2026-04-08 00:00 | 11:09:00.43 | -06:25:45.8 | HIP 54458 | 7.20 |
| 2026-04-08 12:00 | 11:08:52.13 | -06:24:18.1 | HIP 54458 | 5.16 |
| 2026-04-09 00:00 | 11:08:43.91 | -06:22:50.6 | HIP 54458 | 3.78 |
| 2026-04-09 12:00 | 11:08:35.78 | -06:21:23.2 | HIP 54458 | 3.82 |
| 2026-04-10 00:00 | 11:08:27.72 | -06:19:56.0 | HIP 54433 | 2.92 |
| 2026-04-10 12:00 | 11:08:19.76 | -06:18:29.0 | HIP 54433 | 0.66 |
| 2026-04-11 00:00 | 11:08:11.87 | -06:17:02.2 | HIP 54433 | 2.07 |
| 2026-04-11 12:00 | 11:08:04.07 | -06:15:35.6 | HIP 54433 | 4.45 |
| 2026-04-12 00:00 | 11:07:56.36 | -06:14:09.2 | HIP 54433 | 6.84 |
| 2026-04-12 12:00 | 11:07:48.74 | -06:12:43.1 | HIP 54433 | 9.22 |
| 2026-04-13 00:00 | 11:07:41.21 | -06:11:17.2 | HIP 54433 | 11.57 |
| 2026-04-13 12:00 | 11:07:33.76 | -06:09:51.6 | HIP 54433 | 13.91 |
| 2026-04-14 00:00 | 11:07:26.41 | -06:08:26.2 | HIP 54433 | 16.22 |
| 2026-04-14 12:00 | 11:07:19.15 | -06:07:01.1 | HIP 54433 | 18.52 |
| 2026-04-15 00:00 | 11:07:11.98 | -06:05:36.3 | HIP 54433 | 20.79 |
| 2026-04-15 12:00 | 11:07:04.90 | -06:04:11.8 | HIP 54433 | 23.05 |
| 2026-04-16 00:00 | 11:06:57.92 | -06:02:47.5 | HIP 54433 | 25.28 |