C/2022 V2 (Lemmon)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2022 V2 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2023-11-01T22:13:51.689280Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:25Z |
| Obs used | 717 |
| NEO | - |
| M1 | 14.700 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-11-02T01:32:56.688000Z |
| Discovery magnitude (MPC) | 20.62 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-09-03.0000000 |
| e | 0.94400369 |
| q (au) | 2.063574 |
| a (au) | 36.851962 |
| i (deg) | 98.906187 |
| Ω (om, deg) | 332.870315 |
| ω (w, deg) | 168.949317 |
| M (ma, deg) | 359.735984 |
Magnitude
Scatter + Global Linear
$$ M_a = (16.023 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 16.023 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.667 |
| 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 |
|---|---|---|---|
| 2022-07-20 | 2023-04-09 | +3.8316 | -2.017 |
| 2023-04-09 | 2023-10-27 | -2.7235 | +0.975 |
| 2023-11-10 | 2024-04-16 | +0.1898 | +0.000 |
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 | 02:37:45.27 | -52:24:49.0 | HIP 12296 | 7.04 |
| 2026-05-12 12:00 | 02:38:00.73 | -52:24:48.4 | HIP 12296 | 5.27 |
| 2026-05-13 00:00 | 02:38:16.17 | -52:24:49.3 | HIP 12296 | 4.17 |
| 2026-05-13 12:00 | 02:38:31.57 | -52:24:51.6 | HIP 12296 | 4.27 |
| 2026-05-14 00:00 | 02:38:46.94 | -52:24:55.4 | HIP 12296 | 5.51 |
| 2026-05-14 12:00 | 02:39:02.28 | -52:25:00.7 | HIP 12296 | 7.32 |
| 2026-05-15 00:00 | 02:39:17.58 | -52:25:07.5 | HIP 12296 | 9.37 |
| 2026-05-15 12:00 | 02:39:32.85 | -52:25:15.7 | HIP 12296 | 11.54 |
| 2026-05-16 00:00 | 02:39:48.09 | -52:25:25.4 | HIP 12296 | 13.77 |
| 2026-05-16 12:00 | 02:40:03.28 | -52:25:36.5 | HIP 12296 | 16.03 |
| 2026-05-17 00:00 | 02:40:18.44 | -52:25:49.2 | HIP 12296 | 18.30 |
| 2026-05-17 12:00 | 02:40:33.56 | -52:26:03.3 | HIP 12296 | 20.59 |
| 2026-05-18 00:00 | 02:40:48.63 | -52:26:18.8 | HIP 12462 | 22.43 |
| 2026-05-18 12:00 | 02:41:03.67 | -52:26:35.8 | HIP 12462 | 22.58 |
| 2026-05-19 00:00 | 02:41:18.66 | -52:26:54.3 | HIP 12462 | 22.93 |
| 2026-05-19 12:00 | 02:41:33.61 | -52:27:14.3 | HIP 12462 | 23.48 |
| 2026-05-20 00:00 | 02:41:48.52 | -52:27:35.7 | HIP 12775 | 22.61 |
| 2026-05-20 12:00 | 02:42:03.38 | -52:27:58.6 | HIP 12775 | 20.34 |
| 2026-05-21 00:00 | 02:42:18.19 | -52:28:22.9 | HIP 12775 | 18.07 |
| 2026-05-21 12:00 | 02:42:32.96 | -52:28:48.7 | HIP 12775 | 15.81 |
| 2026-05-22 00:00 | 02:42:47.68 | -52:29:15.9 | HIP 12775 | 13.55 |
| 2026-05-22 12:00 | 02:43:02.34 | -52:29:44.6 | HIP 12775 | 11.31 |
| 2026-05-23 00:00 | 02:43:16.96 | -52:30:14.7 | HIP 12775 | 9.08 |
| 2026-05-23 12:00 | 02:43:31.53 | -52:30:46.2 | HIP 12775 | 6.88 |
| 2026-05-24 00:00 | 02:43:46.04 | -52:31:19.2 | HIP 12775 | 4.73 |
| 2026-05-24 12:00 | 02:44:00.51 | -52:31:53.7 | HIP 12775 | 2.80 |
| 2026-05-25 00:00 | 02:44:14.91 | -52:32:29.5 | HIP 12775 | 1.86 |
| 2026-05-25 12:00 | 02:44:29.27 | -52:33:06.8 | HIP 12775 | 3.05 |
| 2026-05-26 00:00 | 02:44:43.57 | -52:33:45.5 | HIP 12775 | 5.03 |
| 2026-05-26 12:00 | 02:44:57.81 | -52:34:25.7 | HIP 12775 | 7.18 |
| 2026-05-27 00:00 | 02:45:11.99 | -52:35:07.3 | HIP 12852 | 7.73 |
| 2026-05-27 12:00 | 02:45:26.12 | -52:35:50.3 | HIP 12852 | 7.23 |
| 2026-05-28 00:00 | 02:45:40.18 | -52:36:34.7 | HIP 12852 | 7.39 |
| 2026-05-28 12:00 | 02:45:54.19 | -52:37:20.5 | HIP 12852 | 8.17 |
| 2026-05-29 00:00 | 02:46:08.14 | -52:38:07.7 | HIP 12852 | 9.42 |
| 2026-05-29 12:00 | 02:46:22.02 | -52:38:56.4 | HIP 12852 | 10.98 |
| 2026-05-30 00:00 | 02:46:35.85 | -52:39:46.4 | HIP 12852 | 12.73 |
| 2026-05-30 12:00 | 02:46:49.60 | -52:40:37.9 | HIP 12852 | 14.61 |
| 2026-05-31 00:00 | 02:47:03.30 | -52:41:30.8 | HIP 12852 | 16.56 |
| 2026-05-31 12:00 | 02:47:16.93 | -52:42:25.0 | HIP 12852 | 18.58 |
| 2026-06-01 00:00 | 02:47:30.49 | -52:43:20.7 | HIP 13185 | 19.87 |
| 2026-06-01 12:00 | 02:47:43.99 | -52:44:17.7 | HIP 13185 | 17.74 |
| 2026-06-02 00:00 | 02:47:57.42 | -52:45:16.2 | HIP 13185 | 15.67 |