C/2024 L5 (ATLAS)
| Parameter |
Value |
| Designation |
C/2024 L5 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-03-10T09:31:21.221760Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:18Z |
| Obs used |
1091 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
17.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-06-14T22:40:01.257600Z |
| Discovery magnitude (MPC) |
17.68 o |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-03-03.0000000 |
| e |
1.03732756 |
| q (au) |
3.432416 |
| a (au) |
-91.953938 |
| i (deg) |
166.573176 |
| Ω (om, deg) |
139.175518 |
| ω (w, deg) |
290.513372 |
| M (ma, deg) |
-0.008268 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.044 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.044 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.542 |
| k |
0.988 |
| δ90 |
9.787 |
| 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) |
| 2026-02-03 00:00 |
10:15:25.35 |
+07:42:03.8 |
HIP 50353 |
39.56 |
| 2026-02-03 12:00 |
10:14:39.49 |
+07:47:25.4 |
HIP 50011 |
31.28 |
| 2026-02-04 00:00 |
10:13:53.52 |
+07:52:47.4 |
HIP 50011 |
22.67 |
| 2026-02-04 12:00 |
10:13:07.45 |
+07:58:09.7 |
HIP 50011 |
19.15 |
| 2026-02-05 00:00 |
10:12:21.28 |
+08:03:32.4 |
HIP 50011 |
23.19 |
| 2026-02-05 12:00 |
10:11:35.03 |
+08:08:55.4 |
HIP 49861 |
29.03 |
| 2026-02-06 00:00 |
10:10:48.69 |
+08:14:18.6 |
HIP 49861 |
32.66 |
| 2026-02-06 12:00 |
10:10:02.27 |
+08:19:42.0 |
HIP 49660 |
31.62 |
| 2026-02-07 00:00 |
10:09:15.78 |
+08:25:05.5 |
HIP 49660 |
27.40 |
| 2026-02-07 12:00 |
10:08:29.22 |
+08:30:29.1 |
HIP 49562 |
25.50 |
| 2026-02-08 00:00 |
10:07:42.61 |
+08:35:52.8 |
HIP 49562 |
13.40 |
| 2026-02-08 12:00 |
10:06:55.94 |
+08:41:16.5 |
HIP 49562 |
5.70 |
| 2026-02-09 00:00 |
10:06:09.22 |
+08:46:40.2 |
HIP 49492 |
3.72 |
| 2026-02-09 12:00 |
10:05:22.46 |
+08:52:03.8 |
HIP 49492 |
13.20 |
| 2026-02-10 00:00 |
10:04:35.67 |
+08:57:27.3 |
HIP 49492 |
25.69 |
| 2026-02-10 12:00 |
10:03:48.84 |
+09:02:50.6 |
HIP 49185 |
31.47 |
| 2026-02-11 00:00 |
10:03:01.99 |
+09:08:13.7 |
HIP 49185 |
29.83 |
| 2026-02-11 12:00 |
10:02:15.13 |
+09:13:36.6 |
HIP 49080 |
24.80 |
| 2026-02-12 00:00 |
10:01:28.25 |
+09:18:59.1 |
HIP 49080 |
23.06 |
| 2026-02-12 12:00 |
10:00:41.37 |
+09:24:21.3 |
HIP 49080 |
27.81 |
| 2026-02-13 00:00 |
09:59:54.49 |
+09:29:43.1 |
HIP 48866 |
30.52 |
| 2026-02-13 12:00 |
09:59:07.62 |
+09:35:04.5 |
HIP 48866 |
17.79 |
| 2026-02-14 00:00 |
09:58:20.76 |
+09:40:25.4 |
HIP 48866 |
5.13 |
| 2026-02-14 12:00 |
09:57:33.93 |
+09:45:45.8 |
HIP 48866 |
7.74 |
| 2026-02-15 00:00 |
09:56:47.12 |
+09:51:05.6 |
HIP 48836 |
15.70 |
| 2026-02-15 12:00 |
09:56:00.34 |
+09:56:24.8 |
HIP 48656 |
13.77 |
| 2026-02-16 00:00 |
09:55:13.60 |
+10:01:43.3 |
HIP 48656 |
5.20 |
| 2026-02-16 12:00 |
09:54:26.91 |
+10:07:01.1 |
HIP 48540 |
11.04 |
| 2026-02-17 00:00 |
09:53:40.28 |
+10:12:18.2 |
HIP 48540 |
5.48 |
| 2026-02-17 12:00 |
09:52:53.70 |
+10:17:34.6 |
HIP 48540 |
16.02 |
| 2026-02-18 00:00 |
09:52:07.18 |
+10:22:50.0 |
HIP 48540 |
28.29 |
| 2026-02-18 12:00 |
09:51:20.74 |
+10:28:04.7 |
HIP 48312 |
25.56 |
| 2026-02-19 00:00 |
09:50:34.37 |
+10:33:18.4 |
HIP 48312 |
20.40 |
| 2026-02-19 12:00 |
09:49:48.09 |
+10:38:31.2 |
HIP 48312 |
22.21 |
| 2026-02-20 00:00 |
09:49:01.90 |
+10:43:43.0 |
HIP 48033 |
23.78 |
| 2026-02-20 12:00 |
09:48:15.80 |
+10:48:53.7 |
HIP 48033 |
11.56 |
| 2026-02-21 00:00 |
09:47:29.80 |
+10:54:03.4 |
HIP 48033 |
3.41 |
| 2026-02-21 12:00 |
09:46:43.91 |
+10:59:12.0 |
HIP 48033 |
14.04 |
| 2026-02-22 00:00 |
09:45:58.14 |
+11:04:19.5 |
HIP 48033 |
26.22 |
| 2026-02-22 12:00 |
09:45:12.48 |
+11:09:25.8 |
HIP 47748 |
30.13 |
| 2026-02-23 00:00 |
09:44:26.95 |
+11:14:30.8 |
HIP 47748 |
30.47 |
| 2026-02-23 12:00 |
09:43:41.55 |
+11:19:34.7 |
HIP 47748 |
35.35 |
| 2026-02-24 00:00 |
09:42:56.29 |
+11:24:37.2 |
HIP 47515 |
27.17 |