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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 16:44:54.56 | -17:57:15.8 | HIP 81899 | 31.34 |
| 2026-05-12 12:00 | 16:44:43.48 | -17:56:32.8 | HIP 81899 | 29.37 |
| 2026-05-13 00:00 | 16:44:32.35 | -17:55:49.8 | HIP 81899 | 27.53 |
| 2026-05-13 12:00 | 16:44:21.17 | -17:55:06.8 | HIP 81899 | 25.84 |
| 2026-05-14 00:00 | 16:44:09.93 | -17:54:23.8 | HIP 81899 | 24.34 |
| 2026-05-14 12:00 | 16:43:58.64 | -17:53:40.9 | HIP 81899 | 23.07 |
| 2026-05-15 00:00 | 16:43:47.30 | -17:52:57.9 | HIP 81899 | 22.09 |
| 2026-05-15 12:00 | 16:43:35.91 | -17:52:15.0 | HIP 81899 | 21.43 |
| 2026-05-16 00:00 | 16:43:24.47 | -17:51:32.1 | HIP 81899 | 21.13 |
| 2026-05-16 12:00 | 16:43:12.99 | -17:50:49.2 | HIP 81899 | 21.20 |
| 2026-05-17 00:00 | 16:43:01.47 | -17:50:06.3 | HIP 81724 | 21.46 |
| 2026-05-17 12:00 | 16:42:49.90 | -17:49:23.5 | HIP 81724 | 18.62 |
| 2026-05-18 00:00 | 16:42:38.29 | -17:48:40.7 | HIP 81724 | 15.77 |
| 2026-05-18 12:00 | 16:42:26.64 | -17:47:58.0 | HIP 81724 | 12.90 |
| 2026-05-19 00:00 | 16:42:14.96 | -17:47:15.3 | HIP 81724 | 10.03 |
| 2026-05-19 12:00 | 16:42:03.24 | -17:46:32.6 | HIP 81724 | 7.16 |
| 2026-05-20 00:00 | 16:41:51.49 | -17:45:50.0 | HIP 81724 | 4.27 |
| 2026-05-20 12:00 | 16:41:39.70 | -17:45:07.5 | HIP 81724 | 1.40 |
| 2026-05-21 00:00 | 16:41:27.89 | -17:44:25.0 | HIP 81724 | 1.55 |
| 2026-05-21 12:00 | 16:41:16.04 | -17:43:42.6 | HIP 81724 | 4.45 |
| 2026-05-22 00:00 | 16:41:04.17 | -17:43:00.2 | HIP 81724 | 7.36 |
| 2026-05-22 12:00 | 16:40:52.28 | -17:42:18.0 | HIP 81724 | 10.27 |
| 2026-05-23 00:00 | 16:40:40.36 | -17:41:35.8 | HIP 81724 | 13.20 |
| 2026-05-23 12:00 | 16:40:28.42 | -17:40:53.6 | HIP 81724 | 16.13 |
| 2026-05-24 00:00 | 16:40:16.46 | -17:40:11.6 | HIP 81724 | 19.06 |
| 2026-05-24 12:00 | 16:40:04.48 | -17:39:29.6 | HIP 81724 | 22.00 |
| 2026-05-25 00:00 | 16:39:52.48 | -17:38:47.7 | HIP 81647 | 23.33 |
| 2026-05-25 12:00 | 16:39:40.47 | -17:38:06.0 | HIP 81647 | 24.38 |
| 2026-05-26 00:00 | 16:39:28.44 | -17:37:24.3 | HIP 81647 | 25.73 |
| 2026-05-26 12:00 | 16:39:16.41 | -17:36:42.7 | HIP 81647 | 27.34 |
| 2026-05-27 00:00 | 16:39:04.36 | -17:36:01.2 | HIP 81393 | 25.57 |
| 2026-05-27 12:00 | 16:38:52.30 | -17:35:19.8 | HIP 81393 | 22.63 |
| 2026-05-28 00:00 | 16:38:40.23 | -17:34:38.5 | HIP 81393 | 19.70 |
| 2026-05-28 12:00 | 16:38:28.16 | -17:33:57.4 | HIP 81393 | 16.77 |
| 2026-05-29 00:00 | 16:38:16.08 | -17:33:16.3 | HIP 81393 | 13.85 |
| 2026-05-29 12:00 | 16:38:04.01 | -17:32:35.4 | HIP 81393 | 10.96 |
| 2026-05-30 00:00 | 16:37:51.92 | -17:31:54.6 | HIP 81393 | 8.11 |
| 2026-05-30 12:00 | 16:37:39.84 | -17:31:13.9 | HIP 81393 | 5.40 |
| 2026-05-31 00:00 | 16:37:27.76 | -17:30:33.4 | HIP 81393 | 3.15 |
| 2026-05-31 12:00 | 16:37:15.69 | -17:29:52.9 | HIP 81393 | 2.87 |
| 2026-06-01 00:00 | 16:37:03.62 | -17:29:12.7 | HIP 81393 | 4.90 |
| 2026-06-01 12:00 | 16:36:51.55 | -17:28:32.5 | HIP 81393 | 7.57 |
| 2026-06-02 00:00 | 16:36:39.49 | -17:27:52.5 | HIP 81393 | 10.39 |