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 · University of Arizona 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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 02:48:10.78 | -52:46:16.0 | HIP 13185 | 13.66 |
| 2026-06-03 00:00 | 02:48:24.07 | -52:47:17.3 | HIP 13185 | 11.76 |
| 2026-06-03 12:00 | 02:48:37.29 | -52:48:19.9 | HIP 13185 | 10.03 |
| 2026-06-04 00:00 | 02:48:50.44 | -52:49:23.9 | HIP 13185 | 8.57 |
| 2026-06-04 12:00 | 02:49:03.52 | -52:50:29.3 | HIP 13185 | 7.54 |
| 2026-06-05 00:00 | 02:49:16.53 | -52:51:36.0 | HIP 13185 | 7.13 |
| 2026-06-05 12:00 | 02:49:29.46 | -52:52:44.2 | HIP 13185 | 7.44 |
| 2026-06-06 00:00 | 02:49:42.31 | -52:53:53.7 | HIP 13185 | 8.39 |
| 2026-06-06 12:00 | 02:49:55.09 | -52:55:04.6 | HIP 13185 | 9.81 |
| 2026-06-07 00:00 | 02:50:07.79 | -52:56:16.8 | HIP 13185 | 11.51 |
| 2026-06-07 12:00 | 02:50:20.41 | -52:57:30.4 | HIP 13218 | 11.02 |
| 2026-06-08 00:00 | 02:50:32.96 | -52:58:45.4 | HIP 13218 | 10.26 |
| 2026-06-08 12:00 | 02:50:45.42 | -53:00:01.7 | HIP 13218 | 9.94 |
| 2026-06-09 00:00 | 02:50:57.81 | -53:01:19.4 | HIP 13218 | 10.10 |
| 2026-06-09 12:00 | 02:51:10.11 | -53:02:38.5 | HIP 13218 | 10.73 |
| 2026-06-10 00:00 | 02:51:22.32 | -53:03:58.9 | HIP 13218 | 11.75 |
| 2026-06-10 12:00 | 02:51:34.46 | -53:05:20.6 | HIP 13218 | 13.06 |
| 2026-06-11 00:00 | 02:51:46.50 | -53:06:43.7 | HIP 13218 | 14.60 |
| 2026-06-11 12:00 | 02:51:58.46 | -53:08:08.2 | HIP 13400 | 15.57 |
| 2026-06-12 00:00 | 02:52:10.34 | -53:09:34.0 | HIP 13400 | 16.56 |
| 2026-06-12 12:00 | 02:52:22.12 | -53:11:01.1 | HIP 13400 | 17.81 |
| 2026-06-13 00:00 | 02:52:33.81 | -53:12:29.5 | HIP 13400 | 19.27 |
| 2026-06-13 12:00 | 02:52:45.42 | -53:13:59.3 | HIP 13400 | 20.90 |
| 2026-06-14 00:00 | 02:52:56.92 | -53:15:30.4 | HIP 13400 | 22.67 |
| 2026-06-14 12:00 | 02:53:08.34 | -53:17:02.8 | HIP 13400 | 24.54 |
| 2026-06-15 00:00 | 02:53:19.66 | -53:18:36.5 | HIP 13400 | 26.50 |
| 2026-06-15 12:00 | 02:53:30.89 | -53:20:11.5 | HIP 13400 | 28.52 |
| 2026-06-16 00:00 | 02:53:42.01 | -53:21:47.8 | HIP 13400 | 30.60 |
| 2026-06-16 12:00 | 02:53:53.04 | -53:23:25.4 | HIP 13400 | 32.73 |
| 2026-06-17 00:00 | 02:54:03.97 | -53:25:04.3 | HIP 13400 | 34.89 |
| 2026-06-17 12:00 | 02:54:14.80 | -53:26:44.5 | HIP 13400 | 37.09 |
| 2026-06-18 00:00 | 02:54:25.53 | -53:28:26.0 | HIP 13400 | 39.31 |
| 2026-06-18 12:00 | 02:54:36.15 | -53:30:08.7 | HIP 13899 | 40.35 |
| 2026-06-19 00:00 | 02:54:46.67 | -53:31:52.7 | HIP 13899 | 38.38 |
| 2026-06-19 12:00 | 02:54:57.08 | -53:33:37.9 | HIP 13899 | 36.46 |
| 2026-06-20 00:00 | 02:55:07.39 | -53:35:24.4 | HIP 13899 | 34.61 |
| 2026-06-20 12:00 | 02:55:17.59 | -53:37:12.1 | HIP 13899 | 32.83 |
| 2026-06-21 00:00 | 02:55:27.69 | -53:39:01.1 | HIP 13899 | 31.15 |
| 2026-06-21 12:00 | 02:55:37.67 | -53:40:51.3 | HIP 13899 | 29.58 |
| 2026-06-22 00:00 | 02:55:47.54 | -53:42:42.7 | HIP 13899 | 28.13 |