| Parameter |
Value |
| Designation |
C/2024 A2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-04-28T21:48:07.764480Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:12:46Z |
| Obs used |
497 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-01-15T08:03:10.915200Z |
| Discovery magnitude (MPC) |
18.04 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-07-05.0000000 |
| e |
0.94184736 |
| q (au) |
1.881640 |
| a (au) |
32.356907 |
| i (deg) |
119.111392 |
| Ω (om, deg) |
78.167124 |
| ω (w, deg) |
295.581197 |
| M (ma, deg) |
0.359271 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.792 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.792 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.726 |
| k |
0.995 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
01:24:36.11 |
+56:26:28.0 |
HIP 6600 |
14.51 |
| 2026-06-01 12:00 |
01:24:45.14 |
+56:29:21.5 |
HIP 6600 |
17.33 |
| 2026-06-02 00:00 |
01:24:54.04 |
+56:32:15.5 |
HIP 6435 |
19.05 |
| 2026-06-02 12:00 |
01:25:02.81 |
+56:35:10.0 |
HIP 6435 |
19.80 |
| 2026-06-03 00:00 |
01:25:11.44 |
+56:38:04.9 |
HIP 6435 |
20.98 |
| 2026-06-03 12:00 |
01:25:19.95 |
+56:41:00.4 |
HIP 6435 |
22.52 |
| 2026-06-04 00:00 |
01:25:28.31 |
+56:43:56.3 |
HIP 6863 |
23.55 |
| 2026-06-04 12:00 |
01:25:36.54 |
+56:46:52.7 |
HIP 6863 |
22.86 |
| 2026-06-05 00:00 |
01:25:44.64 |
+56:49:49.6 |
HIP 6863 |
22.62 |
| 2026-06-05 12:00 |
01:25:52.59 |
+56:52:46.9 |
HIP 6571 |
22.50 |
| 2026-06-06 00:00 |
01:26:00.40 |
+56:55:44.6 |
HIP 6571 |
20.69 |
| 2026-06-06 12:00 |
01:26:08.07 |
+56:58:42.9 |
HIP 6571 |
19.20 |
| 2026-06-07 00:00 |
01:26:15.60 |
+57:01:41.5 |
HIP 6571 |
18.12 |
| 2026-06-07 12:00 |
01:26:22.98 |
+57:04:40.6 |
HIP 6571 |
17.53 |
| 2026-06-08 00:00 |
01:26:30.22 |
+57:07:40.1 |
HIP 6571 |
17.46 |
| 2026-06-08 12:00 |
01:26:37.31 |
+57:10:40.1 |
HIP 6747 |
15.66 |
| 2026-06-09 00:00 |
01:26:44.24 |
+57:13:40.4 |
HIP 6747 |
12.58 |
| 2026-06-09 12:00 |
01:26:51.03 |
+57:16:41.2 |
HIP 6747 |
9.53 |
| 2026-06-10 00:00 |
01:26:57.67 |
+57:19:42.3 |
HIP 6747 |
6.57 |
| 2026-06-10 12:00 |
01:27:04.15 |
+57:22:43.9 |
HIP 6747 |
3.89 |
| 2026-06-11 00:00 |
01:27:10.47 |
+57:25:45.8 |
HIP 6747 |
2.62 |
| 2026-06-11 12:00 |
01:27:16.64 |
+57:28:48.1 |
HIP 6747 |
4.28 |
| 2026-06-12 00:00 |
01:27:22.65 |
+57:31:50.8 |
HIP 6747 |
7.03 |
| 2026-06-12 12:00 |
01:27:28.49 |
+57:34:53.8 |
HIP 6775 |
8.94 |
| 2026-06-13 00:00 |
01:27:34.18 |
+57:37:57.2 |
HIP 6775 |
6.55 |
| 2026-06-13 12:00 |
01:27:39.70 |
+57:41:00.9 |
HIP 6775 |
5.06 |
| 2026-06-14 00:00 |
01:27:45.06 |
+57:44:05.0 |
HIP 6775 |
5.28 |
| 2026-06-14 12:00 |
01:27:50.24 |
+57:47:09.4 |
HIP 6871 |
5.18 |
| 2026-06-15 00:00 |
01:27:55.26 |
+57:50:14.1 |
HIP 6871 |
4.14 |
| 2026-06-15 12:00 |
01:28:00.11 |
+57:53:19.2 |
HIP 6871 |
5.24 |
| 2026-06-16 00:00 |
01:28:04.79 |
+57:56:24.5 |
HIP 6871 |
7.61 |
| 2026-06-16 12:00 |
01:28:09.29 |
+57:59:30.1 |
HIP 6871 |
10.41 |
| 2026-06-17 00:00 |
01:28:13.62 |
+58:02:36.0 |
HIP 6871 |
13.37 |
| 2026-06-17 12:00 |
01:28:17.77 |
+58:05:42.2 |
HIP 6871 |
16.41 |
| 2026-06-18 00:00 |
01:28:21.75 |
+58:08:48.6 |
HIP 6871 |
19.49 |
| 2026-06-18 12:00 |
01:28:25.54 |
+58:11:55.3 |
HIP 6871 |
22.60 |
| 2026-06-19 00:00 |
01:28:29.15 |
+58:15:02.3 |
HIP 7092 |
23.39 |
| 2026-06-19 12:00 |
01:28:32.58 |
+58:18:09.4 |
HIP 7092 |
23.70 |
| 2026-06-20 00:00 |
01:28:35.83 |
+58:21:16.8 |
HIP 7092 |
24.44 |
| 2026-06-20 12:00 |
01:28:38.89 |
+58:24:24.5 |
HIP 6985 |
23.47 |
| 2026-06-21 00:00 |
01:28:41.76 |
+58:27:32.3 |
HIP 6985 |
20.49 |
| 2026-06-21 12:00 |
01:28:44.44 |
+58:30:40.3 |
HIP 6985 |
17.58 |
| 2026-06-22 00:00 |
01:28:46.94 |
+58:33:48.5 |
HIP 6985 |
14.78 |