| Parameter |
Value |
| Designation |
C/2023 TD22 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-09-16T06:57:35.680320Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:20Z |
| Obs used |
613 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-08-15.0000000 |
| e |
0.95098531 |
| q (au) |
2.356801 |
| a (au) |
48.083568 |
| i (deg) |
170.489642 |
| Ω (om, deg) |
5.555951 |
| ω (w, deg) |
32.533345 |
| M (ma, deg) |
359.904550 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.563 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.563 |
| n |
2.000 |
| gf |
0.959 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
3.114 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:20:16.70 |
-08:42:17.8 |
HIP 70060 |
1.07 |
| 2026-09-20 12:00 |
14:20:23.79 |
-08:43:16.2 |
HIP 70060 |
2.94 |
| 2026-09-21 00:00 |
14:20:30.95 |
-08:44:14.7 |
HIP 70060 |
4.93 |
| 2026-09-21 12:00 |
14:20:38.18 |
-08:45:13.2 |
HIP 70060 |
6.95 |
| 2026-09-22 00:00 |
14:20:45.46 |
-08:46:11.9 |
HIP 70060 |
8.99 |
| 2026-09-22 12:00 |
14:20:52.81 |
-08:47:10.7 |
HIP 70060 |
11.05 |
| 2026-09-23 00:00 |
14:21:00.21 |
-08:48:09.6 |
HIP 70060 |
13.12 |
| 2026-09-23 12:00 |
14:21:07.67 |
-08:49:08.6 |
HIP 70060 |
15.21 |
| 2026-09-24 00:00 |
14:21:15.19 |
-08:50:07.8 |
HIP 70060 |
17.31 |
| 2026-09-24 12:00 |
14:21:22.77 |
-08:51:07.0 |
HIP 70060 |
19.42 |
| 2026-09-25 00:00 |
14:21:30.40 |
-08:52:06.2 |
HIP 70060 |
21.55 |
| 2026-09-25 12:00 |
14:21:38.09 |
-08:53:05.6 |
HIP 70302 |
21.27 |
| 2026-09-26 00:00 |
14:21:45.84 |
-08:54:05.1 |
HIP 70302 |
19.23 |
| 2026-09-26 12:00 |
14:21:53.63 |
-08:55:04.6 |
HIP 70302 |
17.21 |
| 2026-09-27 00:00 |
14:22:01.48 |
-08:56:04.2 |
HIP 70302 |
15.20 |
| 2026-09-27 12:00 |
14:22:09.39 |
-08:57:03.9 |
HIP 70302 |
13.24 |
| 2026-09-28 00:00 |
14:22:17.34 |
-08:58:03.6 |
HIP 70302 |
11.36 |
| 2026-09-28 12:00 |
14:22:25.35 |
-08:59:03.4 |
HIP 70302 |
9.60 |
| 2026-09-29 00:00 |
14:22:33.40 |
-09:00:03.3 |
HIP 70302 |
8.05 |
| 2026-09-29 12:00 |
14:22:41.51 |
-09:01:03.2 |
HIP 70302 |
6.88 |
| 2026-09-30 00:00 |
14:22:49.66 |
-09:02:03.1 |
HIP 70302 |
6.30 |
| 2026-09-30 12:00 |
14:22:57.87 |
-09:03:03.2 |
HIP 70302 |
6.50 |
| 2026-10-01 00:00 |
14:23:06.12 |
-09:04:03.2 |
HIP 70302 |
7.42 |
| 2026-10-01 12:00 |
14:23:14.41 |
-09:05:03.3 |
HIP 70302 |
8.84 |
| 2026-10-02 00:00 |
14:23:22.75 |
-09:06:03.4 |
HIP 70302 |
10.57 |
| 2026-10-02 12:00 |
14:23:31.14 |
-09:07:03.6 |
HIP 70302 |
12.49 |
| 2026-10-03 00:00 |
14:23:39.57 |
-09:08:03.8 |
HIP 70302 |
14.53 |
| 2026-10-03 12:00 |
14:23:48.05 |
-09:09:04.0 |
HIP 70302 |
16.65 |
| 2026-10-04 00:00 |
14:23:56.57 |
-09:10:04.3 |
HIP 70302 |
18.82 |
| 2026-10-04 12:00 |
14:24:05.13 |
-09:11:04.5 |
HIP 70302 |
21.04 |
| 2026-10-05 00:00 |
14:24:13.73 |
-09:12:04.8 |
HIP 70302 |
23.28 |
| 2026-10-05 12:00 |
14:24:22.38 |
-09:13:05.1 |
HIP 70302 |
25.56 |
| 2026-10-06 00:00 |
14:24:31.06 |
-09:14:05.3 |
HIP 70302 |
27.85 |
| 2026-10-06 12:00 |
14:24:39.78 |
-09:15:05.6 |
HIP 70302 |
30.16 |
| 2026-10-07 00:00 |
14:24:48.54 |
-09:16:05.9 |
HIP 70302 |
32.49 |
| 2026-10-07 12:00 |
14:24:57.34 |
-09:17:06.2 |
HIP 70302 |
34.84 |
| 2026-10-08 00:00 |
14:25:06.17 |
-09:18:06.4 |
HIP 70302 |
37.20 |
| 2026-10-08 12:00 |
14:25:15.04 |
-09:19:06.6 |
HIP 70302 |
39.57 |
| 2026-10-09 00:00 |
14:25:23.95 |
-09:20:06.9 |
HIP 70302 |
41.95 |
| 2026-10-09 12:00 |
14:25:32.89 |
-09:21:07.0 |
HIP 70302 |
44.34 |
| 2026-10-10 00:00 |
14:25:41.86 |
-09:22:07.2 |
HIP 70302 |
46.74 |
| 2026-10-10 12:00 |
14:25:50.87 |
-09:23:07.3 |
HIP 70302 |
49.15 |
| 2026-10-11 00:00 |
14:25:59.90 |
-09:24:07.4 |
HIP 70752 |
50.31 |