| Parameter |
Value |
| Designation |
C/2024 L5 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-03-10T09:34:28.917120Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:18Z |
| Obs used |
1218 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
15.500 |
| 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) |
2025-04-26.0000000 |
| e |
1.03719810 |
| q (au) |
3.432407 |
| a (au) |
-92.273697 |
| i (deg) |
166.573102 |
| Ω (om, deg) |
139.176328 |
| ω (w, deg) |
290.514693 |
| M (ma, deg) |
0.051818 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.290 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.290 |
| n |
6.000 |
| gf |
0.816 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
08:39:31.85 |
+18:59:31.3 |
HIP 42542 |
24.27 |
| 2026-06-01 12:00 |
08:39:34.77 |
+18:59:54.2 |
HIP 42542 |
23.61 |
| 2026-06-02 00:00 |
08:39:37.81 |
+19:00:16.5 |
HIP 42542 |
22.96 |
| 2026-06-02 12:00 |
08:39:40.99 |
+19:00:38.3 |
HIP 42542 |
22.31 |
| 2026-06-03 00:00 |
08:39:44.30 |
+19:00:59.4 |
HIP 42542 |
21.67 |
| 2026-06-03 12:00 |
08:39:47.74 |
+19:01:19.9 |
HIP 42542 |
21.05 |
| 2026-06-04 00:00 |
08:39:51.30 |
+19:01:39.8 |
HIP 42542 |
20.45 |
| 2026-06-04 12:00 |
08:39:54.99 |
+19:01:59.2 |
HIP 42542 |
19.86 |
| 2026-06-05 00:00 |
08:39:58.81 |
+19:02:18.0 |
HIP 42542 |
19.31 |
| 2026-06-05 12:00 |
08:40:02.75 |
+19:02:36.2 |
HIP 42542 |
18.79 |
| 2026-06-06 00:00 |
08:40:06.81 |
+19:02:53.8 |
HIP 42542 |
18.32 |
| 2026-06-06 12:00 |
08:40:10.99 |
+19:03:10.9 |
HIP 42542 |
17.89 |
| 2026-06-07 00:00 |
08:40:15.30 |
+19:03:27.4 |
HIP 42542 |
17.52 |
| 2026-06-07 12:00 |
08:40:19.72 |
+19:03:43.4 |
HIP 42542 |
17.22 |
| 2026-06-08 00:00 |
08:40:24.25 |
+19:03:58.9 |
HIP 42542 |
16.99 |
| 2026-06-08 12:00 |
08:40:28.91 |
+19:04:13.8 |
HIP 42542 |
16.84 |
| 2026-06-09 00:00 |
08:40:33.67 |
+19:04:28.2 |
HIP 42542 |
16.78 |
| 2026-06-09 12:00 |
08:40:38.55 |
+19:04:42.1 |
HIP 42542 |
16.81 |
| 2026-06-10 00:00 |
08:40:43.55 |
+19:04:55.4 |
HIP 42542 |
16.94 |
| 2026-06-10 12:00 |
08:40:48.65 |
+19:05:08.2 |
HIP 42542 |
17.18 |
| 2026-06-11 00:00 |
08:40:53.86 |
+19:05:20.6 |
HIP 42542 |
17.51 |
| 2026-06-11 12:00 |
08:40:59.18 |
+19:05:32.4 |
HIP 42542 |
17.95 |
| 2026-06-12 00:00 |
08:41:04.60 |
+19:05:43.7 |
HIP 42705 |
18.40 |
| 2026-06-12 12:00 |
08:41:10.13 |
+19:05:54.6 |
HIP 42705 |
17.40 |
| 2026-06-13 00:00 |
08:41:15.77 |
+19:06:04.9 |
HIP 42705 |
16.42 |
| 2026-06-13 12:00 |
08:41:21.51 |
+19:06:14.8 |
HIP 42705 |
15.48 |
| 2026-06-14 00:00 |
08:41:27.34 |
+19:06:24.2 |
HIP 42705 |
14.58 |
| 2026-06-14 12:00 |
08:41:33.28 |
+19:06:33.2 |
HIP 42705 |
13.74 |
| 2026-06-15 00:00 |
08:41:39.31 |
+19:06:41.6 |
HIP 42705 |
12.98 |
| 2026-06-15 12:00 |
08:41:45.45 |
+19:06:49.7 |
HIP 42705 |
12.32 |
| 2026-06-16 00:00 |
08:41:51.67 |
+19:06:57.3 |
HIP 42705 |
11.79 |
| 2026-06-16 12:00 |
08:41:58.00 |
+19:07:04.4 |
HIP 42705 |
11.42 |
| 2026-06-17 00:00 |
08:42:04.41 |
+19:07:11.1 |
HIP 42705 |
11.22 |
| 2026-06-17 12:00 |
08:42:10.91 |
+19:07:17.4 |
HIP 42705 |
11.23 |
| 2026-06-18 00:00 |
08:42:17.51 |
+19:07:23.3 |
HIP 42705 |
11.43 |
| 2026-06-18 12:00 |
08:42:24.19 |
+19:07:28.7 |
HIP 42705 |
11.84 |
| 2026-06-19 00:00 |
08:42:30.96 |
+19:07:33.7 |
HIP 42705 |
12.44 |
| 2026-06-19 12:00 |
08:42:37.82 |
+19:07:38.4 |
HIP 42705 |
13.22 |
| 2026-06-20 00:00 |
08:42:44.76 |
+19:07:42.6 |
HIP 42705 |
14.14 |
| 2026-06-20 12:00 |
08:42:51.78 |
+19:07:46.4 |
HIP 42705 |
15.19 |
| 2026-06-21 00:00 |
08:42:58.89 |
+19:07:49.9 |
HIP 42853 |
14.71 |
| 2026-06-21 12:00 |
08:43:06.07 |
+19:07:52.9 |
HIP 42853 |
13.19 |
| 2026-06-22 00:00 |
08:43:13.33 |
+19:07:55.6 |
HIP 42853 |
11.70 |