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 · University of Arizona 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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 16:25:57.00 | -17:00:37.0 | HIP 80403 | 37.64 |
| 2026-09-20 12:00 | 16:26:06.03 | -17:01:00.8 | HIP 80403 | 38.38 |
| 2026-09-21 00:00 | 16:26:15.15 | -17:01:24.7 | HIP 80403 | 39.24 |
| 2026-09-21 12:00 | 16:26:24.37 | -17:01:48.8 | HIP 80403 | 40.22 |
| 2026-09-22 00:00 | 16:26:33.67 | -17:02:12.9 | HIP 80711 | 40.93 |
| 2026-09-22 12:00 | 16:26:43.07 | -17:02:37.2 | HIP 80711 | 38.98 |
| 2026-09-23 00:00 | 16:26:52.56 | -17:03:01.7 | HIP 80711 | 37.04 |
| 2026-09-23 12:00 | 16:27:02.14 | -17:03:26.2 | HIP 80711 | 35.13 |
| 2026-09-24 00:00 | 16:27:11.81 | -17:03:50.9 | HIP 80711 | 33.25 |
| 2026-09-24 12:00 | 16:27:21.57 | -17:04:15.6 | HIP 80711 | 31.43 |
| 2026-09-25 00:00 | 16:27:31.42 | -17:04:40.5 | HIP 80711 | 29.66 |
| 2026-09-25 12:00 | 16:27:41.35 | -17:05:05.5 | HIP 80711 | 27.98 |
| 2026-09-26 00:00 | 16:27:51.38 | -17:05:30.6 | HIP 80711 | 26.40 |
| 2026-09-26 12:00 | 16:28:01.49 | -17:05:55.8 | HIP 80711 | 24.94 |
| 2026-09-27 00:00 | 16:28:11.69 | -17:06:21.1 | HIP 80711 | 23.64 |
| 2026-09-27 12:00 | 16:28:21.97 | -17:06:46.5 | HIP 80711 | 22.53 |
| 2026-09-28 00:00 | 16:28:32.34 | -17:07:12.0 | HIP 80711 | 21.65 |
| 2026-09-28 12:00 | 16:28:42.79 | -17:07:37.6 | HIP 80711 | 21.03 |
| 2026-09-29 00:00 | 16:28:53.33 | -17:08:03.2 | HIP 80711 | 20.70 |
| 2026-09-29 12:00 | 16:29:03.96 | -17:08:29.0 | HIP 80711 | 20.69 |
| 2026-09-30 00:00 | 16:29:14.66 | -17:08:54.8 | HIP 80711 | 21.00 |
| 2026-09-30 12:00 | 16:29:25.45 | -17:09:20.7 | HIP 80711 | 21.63 |
| 2026-10-01 00:00 | 16:29:36.33 | -17:09:46.7 | HIP 80711 | 22.55 |
| 2026-10-01 12:00 | 16:29:47.28 | -17:10:12.8 | HIP 80711 | 23.75 |
| 2026-10-02 00:00 | 16:29:58.32 | -17:10:39.0 | HIP 80711 | 25.17 |
| 2026-10-02 12:00 | 16:30:09.43 | -17:11:05.2 | HIP 80711 | 26.81 |
| 2026-10-03 00:00 | 16:30:20.63 | -17:11:31.5 | HIP 80711 | 28.61 |
| 2026-10-03 12:00 | 16:30:31.91 | -17:11:57.8 | HIP 80711 | 30.57 |
| 2026-10-04 00:00 | 16:30:43.27 | -17:12:24.2 | HIP 80711 | 32.65 |
| 2026-10-04 12:00 | 16:30:54.71 | -17:12:50.7 | HIP 80940 | 31.74 |
| 2026-10-05 00:00 | 16:31:06.23 | -17:13:17.2 | HIP 80940 | 30.52 |
| 2026-10-05 12:00 | 16:31:17.82 | -17:13:43.8 | HIP 80940 | 29.50 |
| 2026-10-06 00:00 | 16:31:29.50 | -17:14:10.4 | HIP 80940 | 28.71 |
| 2026-10-06 12:00 | 16:31:41.25 | -17:14:37.1 | HIP 80998 | 27.15 |
| 2026-10-07 00:00 | 16:31:53.07 | -17:15:03.8 | HIP 80998 | 25.60 |
| 2026-10-07 12:00 | 16:32:04.98 | -17:15:30.5 | HIP 80998 | 24.29 |
| 2026-10-08 00:00 | 16:32:16.95 | -17:15:57.3 | HIP 80998 | 23.26 |
| 2026-10-08 12:00 | 16:32:29.01 | -17:16:24.1 | HIP 80998 | 22.55 |
| 2026-10-09 00:00 | 16:32:41.14 | -17:16:51.0 | HIP 80998 | 22.21 |
| 2026-10-09 12:00 | 16:32:53.34 | -17:17:17.9 | HIP 80998 | 22.25 |
| 2026-10-10 00:00 | 16:33:05.61 | -17:17:44.8 | HIP 80998 | 22.68 |
| 2026-10-10 12:00 | 16:33:17.96 | -17:18:11.7 | HIP 80998 | 23.49 |
| 2026-10-11 00:00 | 16:33:30.38 | -17:18:38.6 | HIP 80998 | 24.64 |