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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 01:58:51.75 | -59:35:56.8 | HIP 9138 | 17.17 |
| 2026-02-03 12:00 | 01:58:52.00 | -59:32:03.9 | HIP 9138 | 13.92 |
| 2026-02-04 00:00 | 01:58:52.49 | -59:28:11.5 | HIP 9138 | 11.10 |
| 2026-02-04 12:00 | 01:58:53.20 | -59:24:19.7 | HIP 9138 | 9.13 |
| 2026-02-05 00:00 | 01:58:54.13 | -59:20:28.3 | HIP 9138 | 8.59 |
| 2026-02-05 12:00 | 01:58:55.29 | -59:16:37.6 | HIP 9138 | 9.72 |
| 2026-02-06 00:00 | 01:58:56.66 | -59:12:47.4 | HIP 9138 | 12.04 |
| 2026-02-06 12:00 | 01:58:58.26 | -59:08:57.7 | HIP 9138 | 15.01 |
| 2026-02-07 00:00 | 01:59:00.07 | -59:05:08.7 | HIP 9138 | 18.32 |
| 2026-02-07 12:00 | 01:59:02.10 | -59:01:20.2 | HIP 9138 | 21.79 |
| 2026-02-08 00:00 | 01:59:04.33 | -58:57:32.3 | HIP 9043 | 22.94 |
| 2026-02-08 12:00 | 01:59:06.78 | -58:53:45.1 | HIP 9043 | 21.57 |
| 2026-02-09 00:00 | 01:59:09.43 | -58:49:58.5 | HIP 9043 | 20.83 |
| 2026-02-09 12:00 | 01:59:12.29 | -58:46:12.6 | HIP 9043 | 20.81 |
| 2026-02-10 00:00 | 01:59:15.36 | -58:42:27.3 | HIP 9043 | 21.48 |
| 2026-02-10 12:00 | 01:59:18.62 | -58:38:42.6 | HIP 9043 | 22.80 |
| 2026-02-11 00:00 | 01:59:22.09 | -58:34:58.7 | HIP 9051 | 22.53 |
| 2026-02-11 12:00 | 01:59:25.75 | -58:31:15.4 | HIP 9051 | 22.21 |
| 2026-02-12 00:00 | 01:59:29.61 | -58:27:32.8 | HIP 9051 | 22.55 |
| 2026-02-12 12:00 | 01:59:33.66 | -58:23:51.0 | HIP 9051 | 23.51 |
| 2026-02-13 00:00 | 01:59:37.90 | -58:20:09.8 | HIP 9051 | 25.02 |
| 2026-02-13 12:00 | 01:59:42.34 | -58:16:29.4 | HIP 9051 | 26.98 |
| 2026-02-14 00:00 | 01:59:46.96 | -58:12:49.8 | HIP 9051 | 29.30 |
| 2026-02-14 12:00 | 01:59:51.77 | -58:09:10.9 | HIP 9051 | 31.90 |
| 2026-02-15 00:00 | 01:59:56.76 | -58:05:32.7 | HIP 9476 | 28.90 |
| 2026-02-15 12:00 | 02:00:01.93 | -58:01:55.4 | HIP 9476 | 25.53 |
| 2026-02-16 00:00 | 02:00:07.28 | -57:58:18.8 | HIP 9476 | 22.25 |
| 2026-02-16 12:00 | 02:00:12.81 | -57:54:43.1 | HIP 9476 | 19.10 |
| 2026-02-17 00:00 | 02:00:18.52 | -57:51:08.1 | HIP 9476 | 16.16 |
| 2026-02-17 12:00 | 02:00:24.40 | -57:47:34.0 | HIP 9476 | 13.57 |
| 2026-02-18 00:00 | 02:00:30.45 | -57:44:00.7 | HIP 9476 | 11.54 |
| 2026-02-18 12:00 | 02:00:36.67 | -57:40:28.2 | HIP 9476 | 10.40 |
| 2026-02-19 00:00 | 02:00:43.06 | -57:36:56.6 | HIP 9476 | 10.45 |
| 2026-02-19 12:00 | 02:00:49.62 | -57:33:25.9 | HIP 9476 | 11.65 |
| 2026-02-20 00:00 | 02:00:56.34 | -57:29:56.0 | HIP 9476 | 13.71 |
| 2026-02-20 12:00 | 02:01:03.23 | -57:26:27.0 | HIP 9549 | 16.24 |
| 2026-02-21 00:00 | 02:01:10.27 | -57:22:58.9 | HIP 9549 | 17.77 |
| 2026-02-21 12:00 | 02:01:17.47 | -57:19:31.7 | HIP 9549 | 19.81 |
| 2026-02-22 00:00 | 02:01:24.83 | -57:16:05.4 | HIP 9549 | 22.23 |
| 2026-02-22 12:00 | 02:01:32.34 | -57:12:40.1 | HIP 9549 | 24.90 |
| 2026-02-23 00:00 | 02:01:40.01 | -57:09:15.6 | HIP 9549 | 27.75 |
| 2026-02-23 12:00 | 02:01:47.82 | -57:05:52.1 | HIP 9247 | 27.14 |
| 2026-02-24 00:00 | 02:01:55.79 | -57:02:29.6 | HIP 9247 | 26.68 |