P/2021 V2 (Fuls)
Metadata
| Parameter | Value |
|---|---|
| Designation | P/2021 V2 (Fuls) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-01-21T10:09:35.496000Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:42Z |
| Obs used | 500 |
| NEO | - |
| M1 | 13.500 |
| K1 | 4.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2021-11-07T07:16:45.811200Z |
| Discovery magnitude (MPC) | 19.72 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-12-05.0000000 |
| e | 0.61379381 |
| q (au) | 3.496557 |
| a (au) | 9.053602 |
| i (deg) | 12.694194 |
| Ω (om, deg) | 232.285290 |
| ω (w, deg) | 259.829523 |
| M (ma, deg) | 358.284211 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.970 + 2.369\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.970 |
| n | 2.369 |
| gf | 1.000 |
| gb | -0.928 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2021-08-07 | 2022-01-05 | +33.5068 | -22.228 |
| 2022-01-05 | 2023-01-20 | -9.6477 | +5.268 |
| 2023-01-22 | 2024-05-31 | +2.3305 | -1.332 |
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 | 16:44:54.48 | -19:27:40.8 | HIP 82038 | 21.21 |
| 2026-02-03 12:00 | 16:45:06.74 | -19:27:38.3 | HIP 82038 | 20.20 |
| 2026-02-04 00:00 | 16:45:18.90 | -19:27:35.5 | HIP 82038 | 19.56 |
| 2026-02-04 12:00 | 16:45:30.96 | -19:27:32.4 | HIP 82038 | 19.32 |
| 2026-02-05 00:00 | 16:45:42.91 | -19:27:28.9 | HIP 82038 | 19.50 |
| 2026-02-05 12:00 | 16:45:54.75 | -19:27:25.1 | HIP 82038 | 20.06 |
| 2026-02-06 00:00 | 16:46:06.48 | -19:27:21.0 | HIP 82038 | 20.96 |
| 2026-02-06 12:00 | 16:46:18.11 | -19:27:16.6 | HIP 82038 | 22.16 |
| 2026-02-07 00:00 | 16:46:29.63 | -19:27:11.9 | HIP 82038 | 23.60 |
| 2026-02-07 12:00 | 16:46:41.04 | -19:27:06.8 | HIP 82038 | 25.23 |
| 2026-02-08 00:00 | 16:46:52.34 | -19:27:01.4 | HIP 82265 | 25.54 |
| 2026-02-08 12:00 | 16:47:03.52 | -19:26:55.7 | HIP 82265 | 23.08 |
| 2026-02-09 00:00 | 16:47:14.60 | -19:26:49.7 | HIP 82265 | 20.69 |
| 2026-02-09 12:00 | 16:47:25.56 | -19:26:43.4 | HIP 82265 | 18.39 |
| 2026-02-10 00:00 | 16:47:36.42 | -19:26:36.7 | HIP 82265 | 16.19 |
| 2026-02-10 12:00 | 16:47:47.15 | -19:26:29.7 | HIP 82265 | 14.12 |
| 2026-02-11 00:00 | 16:47:57.78 | -19:26:22.5 | HIP 82265 | 12.25 |
| 2026-02-11 12:00 | 16:48:08.29 | -19:26:14.9 | HIP 82265 | 10.66 |
| 2026-02-12 00:00 | 16:48:18.68 | -19:26:06.9 | HIP 82265 | 9.46 |
| 2026-02-12 12:00 | 16:48:28.96 | -19:25:58.7 | HIP 82265 | 8.80 |
| 2026-02-13 00:00 | 16:48:39.12 | -19:25:50.2 | HIP 82265 | 8.77 |
| 2026-02-13 12:00 | 16:48:49.17 | -19:25:41.3 | HIP 82265 | 9.36 |
| 2026-02-14 00:00 | 16:48:59.09 | -19:25:32.1 | HIP 82265 | 10.45 |
| 2026-02-14 12:00 | 16:49:08.90 | -19:25:22.7 | HIP 82307 | 11.21 |
| 2026-02-15 00:00 | 16:49:18.59 | -19:25:12.9 | HIP 82307 | 11.94 |
| 2026-02-15 12:00 | 16:49:28.16 | -19:25:02.8 | HIP 82307 | 13.03 |
| 2026-02-16 00:00 | 16:49:37.61 | -19:24:52.3 | HIP 82307 | 14.38 |
| 2026-02-16 12:00 | 16:49:46.93 | -19:24:41.6 | HIP 82307 | 15.92 |
| 2026-02-17 00:00 | 16:49:56.14 | -19:24:30.6 | HIP 82307 | 17.58 |
| 2026-02-17 12:00 | 16:50:05.22 | -19:24:19.2 | HIP 82307 | 19.32 |
| 2026-02-18 00:00 | 16:50:14.18 | -19:24:07.6 | HIP 82465 | 18.50 |
| 2026-02-18 12:00 | 16:50:23.02 | -19:23:55.7 | HIP 82465 | 16.92 |
| 2026-02-19 00:00 | 16:50:31.73 | -19:23:43.4 | HIP 82465 | 15.48 |
| 2026-02-19 12:00 | 16:50:40.32 | -19:23:30.8 | HIP 82465 | 14.20 |
| 2026-02-20 00:00 | 16:50:48.78 | -19:23:18.0 | HIP 82465 | 13.12 |
| 2026-02-20 12:00 | 16:50:57.12 | -19:23:04.8 | HIP 82465 | 12.28 |
| 2026-02-21 00:00 | 16:51:05.34 | -19:22:51.4 | HIP 82465 | 11.71 |
| 2026-02-21 12:00 | 16:51:13.42 | -19:22:37.6 | HIP 82465 | 11.45 |
| 2026-02-22 00:00 | 16:51:21.38 | -19:22:23.5 | HIP 82465 | 11.50 |
| 2026-02-22 12:00 | 16:51:29.21 | -19:22:09.2 | HIP 82465 | 11.83 |
| 2026-02-23 00:00 | 16:51:36.92 | -19:21:54.5 | HIP 82547 | 10.33 |
| 2026-02-23 12:00 | 16:51:44.50 | -19:21:39.6 | HIP 82547 | 8.53 |
| 2026-02-24 00:00 | 16:51:51.95 | -19:21:24.3 | HIP 82547 | 6.77 |