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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 11:03:18.47 | -05:00:04.9 | HIP 54014 | 5.29 |
| 2026-05-12 12:00 | 11:03:17.18 | -04:59:07.4 | HIP 54014 | 4.62 |
| 2026-05-13 00:00 | 11:03:15.99 | -04:58:10.6 | HIP 54014 | 4.13 |
| 2026-05-13 12:00 | 11:03:14.93 | -04:57:14.4 | HIP 54014 | 3.87 |
| 2026-05-14 00:00 | 11:03:13.97 | -04:56:18.9 | HIP 54014 | 3.86 |
| 2026-05-14 12:00 | 11:03:13.13 | -04:55:24.1 | HIP 54014 | 4.10 |
| 2026-05-15 00:00 | 11:03:12.41 | -04:54:29.9 | HIP 54014 | 4.54 |
| 2026-05-15 12:00 | 11:03:11.80 | -04:53:36.5 | HIP 54014 | 5.12 |
| 2026-05-16 00:00 | 11:03:11.30 | -04:52:43.7 | HIP 54014 | 5.78 |
| 2026-05-16 12:00 | 11:03:10.92 | -04:51:51.6 | HIP 54014 | 6.50 |
| 2026-05-17 00:00 | 11:03:10.65 | -04:51:00.1 | HIP 54014 | 7.26 |
| 2026-05-17 12:00 | 11:03:10.49 | -04:50:09.4 | HIP 54014 | 8.03 |
| 2026-05-18 00:00 | 11:03:10.45 | -04:49:19.4 | HIP 54014 | 8.82 |
| 2026-05-18 12:00 | 11:03:10.53 | -04:48:30.0 | HIP 54014 | 9.61 |
| 2026-05-19 00:00 | 11:03:10.71 | -04:47:41.4 | HIP 54014 | 10.40 |
| 2026-05-19 12:00 | 11:03:11.01 | -04:46:53.5 | HIP 54014 | 11.19 |
| 2026-05-20 00:00 | 11:03:11.43 | -04:46:06.2 | HIP 54014 | 11.98 |
| 2026-05-20 12:00 | 11:03:11.96 | -04:45:19.7 | HIP 54014 | 12.76 |
| 2026-05-21 00:00 | 11:03:12.60 | -04:44:33.9 | HIP 54014 | 13.54 |
| 2026-05-21 12:00 | 11:03:13.35 | -04:43:48.9 | HIP 54014 | 14.32 |
| 2026-05-22 00:00 | 11:03:14.22 | -04:43:04.5 | HIP 54014 | 15.09 |
| 2026-05-22 12:00 | 11:03:15.20 | -04:42:20.8 | HIP 54014 | 15.85 |
| 2026-05-23 00:00 | 11:03:16.29 | -04:41:37.9 | HIP 54014 | 16.61 |
| 2026-05-23 12:00 | 11:03:17.50 | -04:40:55.7 | HIP 54014 | 17.37 |
| 2026-05-24 00:00 | 11:03:18.81 | -04:40:14.2 | HIP 54014 | 18.12 |
| 2026-05-24 12:00 | 11:03:20.24 | -04:39:33.5 | HIP 54014 | 18.87 |
| 2026-05-25 00:00 | 11:03:21.78 | -04:38:53.4 | HIP 54014 | 19.62 |
| 2026-05-25 12:00 | 11:03:23.43 | -04:38:14.1 | HIP 54014 | 20.36 |
| 2026-05-26 00:00 | 11:03:25.19 | -04:37:35.6 | HIP 54014 | 21.11 |
| 2026-05-26 12:00 | 11:03:27.06 | -04:36:57.7 | HIP 54014 | 21.85 |
| 2026-05-27 00:00 | 11:03:29.04 | -04:36:20.6 | HIP 54014 | 22.60 |
| 2026-05-27 12:00 | 11:03:31.13 | -04:35:44.2 | HIP 54014 | 23.34 |
| 2026-05-28 00:00 | 11:03:33.33 | -04:35:08.5 | HIP 54014 | 24.09 |
| 2026-05-28 12:00 | 11:03:35.64 | -04:34:33.6 | HIP 54014 | 24.84 |
| 2026-05-29 00:00 | 11:03:38.06 | -04:33:59.4 | HIP 54014 | 25.59 |
| 2026-05-29 12:00 | 11:03:40.58 | -04:33:26.0 | HIP 54155 | 25.27 |
| 2026-05-30 00:00 | 11:03:43.22 | -04:32:53.2 | HIP 54155 | 24.44 |
| 2026-05-30 12:00 | 11:03:45.96 | -04:32:21.3 | HIP 54155 | 23.60 |
| 2026-05-31 00:00 | 11:03:48.81 | -04:31:50.0 | HIP 54155 | 22.77 |
| 2026-05-31 12:00 | 11:03:51.76 | -04:31:19.5 | HIP 54155 | 21.93 |
| 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 |