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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 11:30:07.58 | -08:53:40.6 | HIP 55955 | 35.83 |
| 2026-02-03 12:00 | 11:29:59.99 | -08:53:13.7 | HIP 55955 | 34.42 |
| 2026-02-04 00:00 | 11:29:52.30 | -08:52:46.0 | HIP 55955 | 33.05 |
| 2026-02-04 12:00 | 11:29:44.53 | -08:52:17.3 | HIP 55955 | 31.74 |
| 2026-02-05 00:00 | 11:29:36.67 | -08:51:47.6 | HIP 55955 | 30.49 |
| 2026-02-05 12:00 | 11:29:28.72 | -08:51:17.1 | HIP 55955 | 29.32 |
| 2026-02-06 00:00 | 11:29:20.68 | -08:50:45.7 | HIP 55955 | 28.24 |
| 2026-02-06 12:00 | 11:29:12.55 | -08:50:13.3 | HIP 55955 | 27.27 |
| 2026-02-07 00:00 | 11:29:04.34 | -08:49:40.1 | HIP 55955 | 26.43 |
| 2026-02-07 12:00 | 11:28:56.04 | -08:49:05.9 | HIP 55890 | 24.74 |
| 2026-02-08 00:00 | 11:28:47.66 | -08:48:30.9 | HIP 55890 | 22.77 |
| 2026-02-08 12:00 | 11:28:39.19 | -08:47:54.9 | HIP 55890 | 20.82 |
| 2026-02-09 00:00 | 11:28:30.65 | -08:47:18.1 | HIP 55890 | 18.91 |
| 2026-02-09 12:00 | 11:28:22.02 | -08:46:40.3 | HIP 55890 | 17.05 |
| 2026-02-10 00:00 | 11:28:13.32 | -08:46:01.7 | HIP 55890 | 15.27 |
| 2026-02-10 12:00 | 11:28:04.54 | -08:45:22.2 | HIP 55890 | 13.63 |
| 2026-02-11 00:00 | 11:27:55.68 | -08:44:41.8 | HIP 55890 | 12.18 |
| 2026-02-11 12:00 | 11:27:46.74 | -08:44:00.5 | HIP 55890 | 11.01 |
| 2026-02-12 00:00 | 11:27:37.73 | -08:43:18.3 | HIP 55890 | 10.25 |
| 2026-02-12 12:00 | 11:27:28.65 | -08:42:35.3 | HIP 55890 | 10.00 |
| 2026-02-13 00:00 | 11:27:19.49 | -08:41:51.4 | HIP 55890 | 10.30 |
| 2026-02-13 12:00 | 11:27:10.26 | -08:41:06.6 | HIP 55890 | 11.14 |
| 2026-02-14 00:00 | 11:27:00.97 | -08:40:21.0 | HIP 55890 | 12.41 |
| 2026-02-14 12:00 | 11:26:51.60 | -08:39:34.6 | HIP 55890 | 14.01 |
| 2026-02-15 00:00 | 11:26:42.17 | -08:38:47.2 | HIP 55890 | 15.84 |
| 2026-02-15 12:00 | 11:26:32.67 | -08:37:59.1 | HIP 55890 | 17.85 |
| 2026-02-16 00:00 | 11:26:23.11 | -08:37:10.1 | HIP 55890 | 19.98 |
| 2026-02-16 12:00 | 11:26:13.49 | -08:36:20.2 | HIP 55730 | 18.27 |
| 2026-02-17 00:00 | 11:26:03.80 | -08:35:29.6 | HIP 55730 | 15.75 |
| 2026-02-17 12:00 | 11:25:54.05 | -08:34:38.1 | HIP 55730 | 13.21 |
| 2026-02-18 00:00 | 11:25:44.25 | -08:33:45.8 | HIP 55730 | 10.66 |
| 2026-02-18 12:00 | 11:25:34.39 | -08:32:52.7 | HIP 55730 | 8.12 |
| 2026-02-19 00:00 | 11:25:24.47 | -08:31:58.8 | HIP 55730 | 5.59 |
| 2026-02-19 12:00 | 11:25:14.49 | -08:31:04.1 | HIP 55730 | 3.19 |
| 2026-02-20 00:00 | 11:25:04.47 | -08:30:08.6 | HIP 55730 | 1.69 |
| 2026-02-20 12:00 | 11:24:54.39 | -08:29:12.4 | HIP 55730 | 3.10 |
| 2026-02-21 00:00 | 11:24:44.27 | -08:28:15.4 | HIP 55730 | 5.54 |
| 2026-02-21 12:00 | 11:24:34.09 | -08:27:17.6 | HIP 55730 | 8.15 |
| 2026-02-22 00:00 | 11:24:23.87 | -08:26:19.0 | HIP 55730 | 10.81 |
| 2026-02-22 12:00 | 11:24:13.61 | -08:25:19.7 | HIP 55730 | 13.50 |
| 2026-02-23 00:00 | 11:24:03.30 | -08:24:19.6 | HIP 55730 | 16.22 |
| 2026-02-23 12:00 | 11:23:52.94 | -08:23:18.9 | HIP 55730 | 18.96 |
| 2026-02-24 00:00 | 11:23:42.55 | -08:22:17.4 | HIP 55556 | 21.45 |