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
$$ M_a = (11.970 + 2.872\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.970 |
| n | 2.872 |
| gf | 1.000 |
| gb | -0.655 |
| 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 | 2022-11-22 | +8.2745 | -5.398 |
| 2022-11-22 | 2026-07-26 | -7.2967 | +4.795 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 11:20:04.59 | -04:53:43.6 | HIP 55210 | 27.65 |
| 2026-07-29 12:00 | 11:20:17.11 | -04:54:32.8 | HIP 55210 | 30.30 |
| 2026-07-30 00:00 | 11:20:29.67 | -04:55:22.5 | HIP 55527 | 31.11 |
| 2026-07-30 12:00 | 11:20:42.28 | -04:56:12.8 | HIP 55527 | 27.92 |
| 2026-07-31 00:00 | 11:20:54.95 | -04:57:03.5 | HIP 55527 | 24.74 |
| 2026-07-31 12:00 | 11:21:07.66 | -04:57:54.8 | HIP 55527 | 21.56 |
| 2026-08-01 00:00 | 11:21:20.41 | -04:58:46.7 | HIP 55527 | 18.41 |
| 2026-08-01 12:00 | 11:21:33.22 | -04:59:39.0 | HIP 55527 | 15.29 |
| 2026-08-02 00:00 | 11:21:46.07 | -05:00:31.9 | HIP 55527 | 12.27 |
| 2026-08-02 12:00 | 11:21:58.97 | -05:01:25.2 | HIP 55527 | 9.43 |
| 2026-08-03 00:00 | 11:22:11.92 | -05:02:19.1 | HIP 55527 | 7.03 |
| 2026-08-03 12:00 | 11:22:24.91 | -05:03:13.5 | HIP 55527 | 5.67 |
| 2026-08-04 00:00 | 11:22:37.95 | -05:04:08.4 | HIP 55527 | 6.13 |
| 2026-08-04 12:00 | 11:22:51.03 | -05:05:03.8 | HIP 55527 | 8.11 |
| 2026-08-05 00:00 | 11:23:04.16 | -05:05:59.7 | HIP 55527 | 10.82 |
| 2026-08-05 12:00 | 11:23:17.33 | -05:06:56.1 | HIP 55527 | 13.85 |
| 2026-08-06 00:00 | 11:23:30.55 | -05:07:53.0 | HIP 55527 | 17.03 |
| 2026-08-06 12:00 | 11:23:43.80 | -05:08:50.4 | HIP 55527 | 20.31 |
| 2026-08-07 00:00 | 11:23:57.10 | -05:09:48.3 | HIP 55527 | 23.64 |
| 2026-08-07 12:00 | 11:24:10.45 | -05:10:46.6 | HIP 55527 | 27.01 |
| 2026-08-08 00:00 | 11:24:23.83 | -05:11:45.5 | HIP 55527 | 30.41 |
| 2026-08-08 12:00 | 11:24:37.25 | -05:12:44.8 | HIP 55527 | 33.84 |
| 2026-08-09 00:00 | 11:24:50.72 | -05:13:44.6 | HIP 55527 | 37.29 |
| 2026-08-09 12:00 | 11:25:04.23 | -05:14:44.9 | HIP 55739 | 37.48 |
| 2026-08-10 00:00 | 11:25:17.77 | -05:15:45.6 | HIP 55739 | 36.38 |
| 2026-08-10 12:00 | 11:25:31.35 | -05:16:46.8 | HIP 55739 | 35.59 |
| 2026-08-11 00:00 | 11:25:44.98 | -05:17:48.5 | HIP 55739 | 35.13 |
| 2026-08-11 12:00 | 11:25:58.64 | -05:18:50.7 | HIP 55739 | 35.02 |
| 2026-08-12 00:00 | 11:26:12.33 | -05:19:53.3 | HIP 55739 | 35.27 |
| 2026-08-12 12:00 | 11:26:26.07 | -05:20:56.3 | HIP 55739 | 35.87 |
| 2026-08-13 00:00 | 11:26:39.84 | -05:21:59.8 | HIP 55739 | 36.80 |
| 2026-08-13 12:00 | 11:26:53.64 | -05:23:03.8 | HIP 55739 | 38.06 |
| 2026-08-14 00:00 | 11:27:07.48 | -05:24:08.2 | HIP 55739 | 39.60 |
| 2026-08-14 12:00 | 11:27:21.36 | -05:25:13.0 | HIP 55739 | 41.40 |
| 2026-08-15 00:00 | 11:27:35.27 | -05:26:18.3 | HIP 55996 | 42.23 |
| 2026-08-15 12:00 | 11:27:49.21 | -05:27:24.0 | HIP 55996 | 40.15 |
| 2026-08-16 00:00 | 11:28:03.18 | -05:28:30.1 | HIP 55996 | 38.28 |
| 2026-08-16 12:00 | 11:28:17.19 | -05:29:36.7 | HIP 55996 | 36.68 |
| 2026-08-17 00:00 | 11:28:31.23 | -05:30:43.6 | HIP 55996 | 35.38 |
| 2026-08-17 12:00 | 11:28:45.29 | -05:31:51.0 | HIP 55996 | 34.42 |
| 2026-08-18 00:00 | 11:28:59.39 | -05:32:58.8 | HIP 55996 | 33.82 |
| 2026-08-18 12:00 | 11:29:13.52 | -05:34:07.0 | HIP 55996 | 33.62 |
| 2026-08-19 00:00 | 11:29:27.68 | -05:35:15.6 | HIP 55996 | 33.82 |