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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 02:37:53.94 | -61:47:40.9 | HIP 12396 | 19.87 |
| 2026-09-20 12:00 | 02:37:28.33 | -61:49:47.2 | HIP 12396 | 23.42 |
| 2026-09-21 00:00 | 02:37:02.53 | -61:51:52.1 | HIP 12396 | 27.00 |
| 2026-09-21 12:00 | 02:36:36.53 | -61:53:55.4 | HIP 12431 | 28.39 |
| 2026-09-22 00:00 | 02:36:10.34 | -61:55:57.2 | HIP 12027 | 29.01 |
| 2026-09-22 12:00 | 02:35:43.95 | -61:57:57.5 | HIP 11912 | 26.32 |
| 2026-09-23 00:00 | 02:35:17.38 | -61:59:56.2 | HIP 11912 | 23.04 |
| 2026-09-23 12:00 | 02:34:50.63 | -62:01:53.3 | HIP 11912 | 19.93 |
| 2026-09-24 00:00 | 02:34:23.69 | -62:03:48.8 | HIP 11912 | 17.07 |
| 2026-09-24 12:00 | 02:33:56.57 | -62:05:42.8 | HIP 11912 | 14.61 |
| 2026-09-25 00:00 | 02:33:29.28 | -62:07:35.1 | HIP 11912 | 12.79 |
| 2026-09-25 12:00 | 02:33:01.80 | -62:09:25.7 | HIP 11912 | 11.90 |
| 2026-09-26 00:00 | 02:32:34.16 | -62:11:14.8 | HIP 11912 | 12.16 |
| 2026-09-26 12:00 | 02:32:06.34 | -62:13:02.1 | HIP 11912 | 13.49 |
| 2026-09-27 00:00 | 02:31:38.36 | -62:14:47.8 | HIP 11912 | 15.62 |
| 2026-09-27 12:00 | 02:31:10.21 | -62:16:31.8 | HIP 11912 | 18.29 |
| 2026-09-28 00:00 | 02:30:41.90 | -62:18:14.1 | HIP 11701 | 17.61 |
| 2026-09-28 12:00 | 02:30:13.43 | -62:19:54.7 | HIP 11701 | 16.61 |
| 2026-09-29 00:00 | 02:29:44.80 | -62:21:33.5 | HIP 11701 | 16.44 |
| 2026-09-29 12:00 | 02:29:16.01 | -62:23:10.7 | HIP 11701 | 17.11 |
| 2026-09-30 00:00 | 02:28:47.07 | -62:24:46.0 | HIP 11701 | 18.53 |
| 2026-09-30 12:00 | 02:28:17.99 | -62:26:19.6 | HIP 11701 | 20.56 |
| 2026-10-01 00:00 | 02:27:48.76 | -62:27:51.4 | HIP 11701 | 23.03 |
| 2026-10-01 12:00 | 02:27:19.38 | -62:29:21.4 | HIP 11701 | 25.81 |
| 2026-10-02 00:00 | 02:26:49.86 | -62:30:49.6 | HIP 11354 | 24.64 |
| 2026-10-02 12:00 | 02:26:20.21 | -62:32:16.0 | HIP 11354 | 22.84 |
| 2026-10-03 00:00 | 02:25:50.42 | -62:33:40.5 | HIP 11354 | 21.56 |
| 2026-10-03 12:00 | 02:25:20.50 | -62:35:03.3 | HIP 11354 | 20.90 |
| 2026-10-04 00:00 | 02:24:50.45 | -62:36:24.1 | HIP 11354 | 20.91 |
| 2026-10-04 12:00 | 02:24:20.28 | -62:37:43.1 | HIP 11354 | 21.60 |
| 2026-10-05 00:00 | 02:23:49.98 | -62:39:00.2 | HIP 10927 | 22.39 |
| 2026-10-05 12:00 | 02:23:19.57 | -62:40:15.4 | HIP 10927 | 19.50 |
| 2026-10-06 00:00 | 02:22:49.04 | -62:41:28.7 | HIP 10927 | 16.90 |
| 2026-10-06 12:00 | 02:22:18.40 | -62:42:40.1 | HIP 10927 | 14.77 |
| 2026-10-07 00:00 | 02:21:47.65 | -62:43:49.6 | HIP 10927 | 13.32 |
| 2026-10-07 12:00 | 02:21:16.80 | -62:44:57.1 | HIP 10927 | 12.79 |
| 2026-10-08 00:00 | 02:20:45.85 | -62:46:02.7 | HIP 10927 | 13.29 |
| 2026-10-08 12:00 | 02:20:14.80 | -62:47:06.3 | HIP 10927 | 14.71 |
| 2026-10-09 00:00 | 02:19:43.66 | -62:48:08.0 | HIP 10692 | 14.72 |
| 2026-10-09 12:00 | 02:19:12.43 | -62:49:07.7 | HIP 10692 | 11.68 |
| 2026-10-10 00:00 | 02:18:41.11 | -62:50:05.4 | HIP 10692 | 9.11 |
| 2026-10-10 12:00 | 02:18:09.71 | -62:51:01.1 | HIP 10692 | 7.53 |
| 2026-10-11 00:00 | 02:17:38.23 | -62:51:54.8 | HIP 10692 | 7.57 |