C/2022 T1 (Lemmon)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2022 T1 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-02-17T12:18:13.901760Z |
| Orbit solution date (soln_date, UTC) | 2024-07-22T18:42:14Z |
| Obs used | 587 |
| NEO | - |
| M1 | 13.100 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-10-03T11:55:57.561600Z |
| Discovery magnitude (MPC) | 21.24 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-10-10.0000000 |
| e | 0.99971338 |
| q (au) | 3.444855 |
| a (au) | 12018.953434 |
| i (deg) | 22.543649 |
| Ω (om, deg) | 236.919592 |
| ω (w, deg) | 324.316453 |
| M (ma, deg) | 359.999902 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.928 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.928 |
| n | 2.000 |
| gf | 0.991 |
| gb | -0.786 |
| k | 1.000 |
| δ90 | 9.981 |
| 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 |
|---|---|---|---|
| 2022-10-03 | 2023-01-17 | +12.9256 | -9.332 |
| 2023-01-17 | 2023-05-12 | +7.4343 | -5.338 |
| 2023-05-12 | 2024-02-14 | -1.8398 | +0.708 |
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 | 19:58:07.51 | +01:07:10.0 | HIP 98147 | 20.33 |
| 2026-06-01 12:00 | 19:58:01.30 | +01:08:12.8 | HIP 98147 | 18.87 |
| 2026-06-02 00:00 | 19:57:54.98 | +01:09:14.8 | HIP 98147 | 17.45 |
| 2026-06-02 12:00 | 19:57:48.56 | +01:10:16.1 | HIP 98147 | 16.11 |
| 2026-06-03 00:00 | 19:57:42.04 | +01:11:16.6 | HIP 98147 | 14.86 |
| 2026-06-03 12:00 | 19:57:35.41 | +01:12:16.4 | HIP 98147 | 13.74 |
| 2026-06-04 00:00 | 19:57:28.69 | +01:13:15.4 | HIP 98147 | 12.78 |
| 2026-06-04 12:00 | 19:57:21.87 | +01:14:13.6 | HIP 98147 | 12.04 |
| 2026-06-05 00:00 | 19:57:14.95 | +01:15:11.0 | HIP 98147 | 11.56 |
| 2026-06-05 12:00 | 19:57:07.93 | +01:16:07.6 | HIP 98147 | 11.38 |
| 2026-06-06 00:00 | 19:57:00.81 | +01:17:03.5 | HIP 98147 | 11.53 |
| 2026-06-06 12:00 | 19:56:53.60 | +01:17:58.6 | HIP 98147 | 12.00 |
| 2026-06-07 00:00 | 19:56:46.29 | +01:18:52.8 | HIP 98147 | 12.77 |
| 2026-06-07 12:00 | 19:56:38.89 | +01:19:46.3 | HIP 98147 | 13.78 |
| 2026-06-08 00:00 | 19:56:31.39 | +01:20:39.0 | HIP 98147 | 15.01 |
| 2026-06-08 12:00 | 19:56:23.80 | +01:21:30.8 | HIP 98147 | 16.39 |
| 2026-06-09 00:00 | 19:56:16.12 | +01:22:21.9 | HIP 98147 | 17.92 |
| 2026-06-09 12:00 | 19:56:08.34 | +01:23:12.1 | HIP 98147 | 19.54 |
| 2026-06-10 00:00 | 19:56:00.48 | +01:24:01.5 | HIP 98147 | 21.26 |
| 2026-06-10 12:00 | 19:55:52.53 | +01:24:50.1 | HIP 98147 | 23.04 |
| 2026-06-11 00:00 | 19:55:44.49 | +01:25:37.9 | HIP 98147 | 24.89 |
| 2026-06-11 12:00 | 19:55:36.36 | +01:26:24.8 | HIP 98147 | 26.79 |
| 2026-06-12 00:00 | 19:55:28.15 | +01:27:10.9 | HIP 98147 | 28.73 |
| 2026-06-12 12:00 | 19:55:19.85 | +01:27:56.1 | HIP 98147 | 30.71 |
| 2026-06-13 00:00 | 19:55:11.46 | +01:28:40.5 | HIP 97950 | 30.10 |
| 2026-06-13 12:00 | 19:55:03.00 | +01:29:24.1 | HIP 97950 | 28.67 |
| 2026-06-14 00:00 | 19:54:54.45 | +01:30:06.8 | HIP 97950 | 27.37 |
| 2026-06-14 12:00 | 19:54:45.82 | +01:30:48.6 | HIP 97950 | 26.20 |
| 2026-06-15 00:00 | 19:54:37.11 | +01:31:29.6 | HIP 97950 | 25.19 |
| 2026-06-15 12:00 | 19:54:28.32 | +01:32:09.8 | HIP 97950 | 24.37 |
| 2026-06-16 00:00 | 19:54:19.46 | +01:32:49.1 | HIP 97950 | 23.76 |
| 2026-06-16 12:00 | 19:54:10.52 | +01:33:27.5 | HIP 97940 | 23.21 |
| 2026-06-17 00:00 | 19:54:01.50 | +01:34:05.0 | HIP 97940 | 22.81 |
| 2026-06-17 12:00 | 19:53:52.42 | +01:34:41.7 | HIP 97940 | 22.66 |
| 2026-06-18 00:00 | 19:53:43.26 | +01:35:17.5 | HIP 97940 | 22.77 |
| 2026-06-18 12:00 | 19:53:34.03 | +01:35:52.5 | HIP 97940 | 23.15 |
| 2026-06-19 00:00 | 19:53:24.72 | +01:36:26.5 | HIP 97762 | 21.04 |
| 2026-06-19 12:00 | 19:53:15.36 | +01:36:59.7 | HIP 97762 | 18.71 |
| 2026-06-20 00:00 | 19:53:05.92 | +01:37:32.1 | HIP 97762 | 16.39 |
| 2026-06-20 12:00 | 19:52:56.42 | +01:38:03.5 | HIP 97762 | 14.09 |
| 2026-06-21 00:00 | 19:52:46.85 | +01:38:34.1 | HIP 97762 | 11.81 |
| 2026-06-21 12:00 | 19:52:37.23 | +01:39:03.8 | HIP 97762 | 9.60 |
| 2026-06-22 00:00 | 19:52:27.53 | +01:39:32.6 | HIP 97762 | 7.53 |