| Parameter |
Value |
| Designation |
C/2024 G2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-06-13T12:56:39.900480Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:18Z |
| Obs used |
591 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
12.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-04-08T07:54:38.131200Z |
| Discovery magnitude (MPC) |
18.63 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-07-10.0000000 |
| e |
0.99268363 |
| q (au) |
5.348239 |
| a (au) |
730.995808 |
| i (deg) |
122.125045 |
| Ω (om, deg) |
171.397029 |
| ω (w, deg) |
328.738230 |
| M (ma, deg) |
0.001320 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.174 + 4.092\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.174 |
| n |
4.092 |
| gf |
0.999 |
| gb |
-0.531 |
| k |
0.800 |
| δ90 |
9.998 |
| 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) |
| 2026-03-26 00:00 |
11:18:33.45 |
+03:42:38.6 |
HIP 55324 |
18.53 |
| 2026-03-26 12:00 |
11:18:09.39 |
+03:48:27.0 |
HIP 55102 |
20.76 |
| 2026-03-27 00:00 |
11:17:45.43 |
+03:54:14.4 |
HIP 55102 |
13.18 |
| 2026-03-27 12:00 |
11:17:21.56 |
+04:00:00.9 |
HIP 55102 |
7.42 |
| 2026-03-28 00:00 |
11:16:57.79 |
+04:05:46.4 |
HIP 55102 |
8.60 |
| 2026-03-28 12:00 |
11:16:34.11 |
+04:11:30.9 |
HIP 55102 |
15.12 |
| 2026-03-29 00:00 |
11:16:10.53 |
+04:17:14.3 |
HIP 54998 |
13.89 |
| 2026-03-29 12:00 |
11:15:47.06 |
+04:22:56.7 |
HIP 54998 |
6.08 |
| 2026-03-30 00:00 |
11:15:23.69 |
+04:28:38.1 |
HIP 54998 |
3.81 |
| 2026-03-30 12:00 |
11:15:00.43 |
+04:34:18.3 |
HIP 54998 |
11.13 |
| 2026-03-31 00:00 |
11:14:37.28 |
+04:39:57.4 |
HIP 54998 |
19.06 |
| 2026-03-31 12:00 |
11:14:14.24 |
+04:45:35.3 |
HIP 54985 |
22.45 |
| 2026-04-01 00:00 |
11:13:51.31 |
+04:51:12.1 |
HIP 54810 |
24.18 |
| 2026-04-01 12:00 |
11:13:28.50 |
+04:56:47.6 |
HIP 54788 |
18.77 |
| 2026-04-02 00:00 |
11:13:05.81 |
+05:02:21.9 |
HIP 54788 |
11.83 |
| 2026-04-02 12:00 |
11:12:43.24 |
+05:07:55.0 |
HIP 54788 |
7.34 |
| 2026-04-03 00:00 |
11:12:20.80 |
+05:13:26.9 |
HIP 54788 |
9.59 |
| 2026-04-03 12:00 |
11:11:58.47 |
+05:18:57.4 |
HIP 54788 |
15.89 |
| 2026-04-04 00:00 |
11:11:36.28 |
+05:24:26.6 |
HIP 54660 |
19.06 |
| 2026-04-04 12:00 |
11:11:14.21 |
+05:29:54.5 |
HIP 54660 |
24.16 |
| 2026-04-05 00:00 |
11:10:52.27 |
+05:35:21.1 |
HIP 54563 |
17.98 |
| 2026-04-05 12:00 |
11:10:30.47 |
+05:40:46.3 |
HIP 54563 |
10.48 |
| 2026-04-06 00:00 |
11:10:08.80 |
+05:46:10.0 |
HIP 54563 |
3.77 |
| 2026-04-06 12:00 |
11:09:47.27 |
+05:51:32.4 |
HIP 54563 |
5.87 |
| 2026-04-07 00:00 |
11:09:25.88 |
+05:56:53.4 |
HIP 54563 |
13.00 |
| 2026-04-07 12:00 |
11:09:04.62 |
+06:02:12.9 |
HIP 54563 |
20.38 |
| 2026-04-08 00:00 |
11:08:43.51 |
+06:07:30.9 |
HIP 54378 |
23.20 |
| 2026-04-08 12:00 |
11:08:22.55 |
+06:12:47.4 |
HIP 54423 |
21.74 |
| 2026-04-09 00:00 |
11:08:01.73 |
+06:18:02.5 |
HIP 54423 |
16.63 |
| 2026-04-09 12:00 |
11:07:41.05 |
+06:23:16.0 |
HIP 54423 |
13.76 |
| 2026-04-10 00:00 |
11:07:20.53 |
+06:28:28.0 |
HIP 54423 |
14.45 |
| 2026-04-10 12:00 |
11:07:00.16 |
+06:33:38.5 |
HIP 54331 |
8.51 |
| 2026-04-11 00:00 |
11:06:39.94 |
+06:38:47.3 |
HIP 54331 |
4.28 |
| 2026-04-11 12:00 |
11:06:19.88 |
+06:43:54.6 |
HIP 54331 |
8.18 |
| 2026-04-12 00:00 |
11:05:59.97 |
+06:49:00.3 |
HIP 54268 |
13.14 |
| 2026-04-12 12:00 |
11:05:40.22 |
+06:54:04.4 |
HIP 54268 |
10.42 |
| 2026-04-13 00:00 |
11:05:20.63 |
+06:59:06.9 |
HIP 54268 |
11.97 |
| 2026-04-13 12:00 |
11:05:01.20 |
+07:04:07.7 |
HIP 54182 |
16.04 |
| 2026-04-14 00:00 |
11:04:41.94 |
+07:09:06.9 |
HIP 54182 |
12.04 |
| 2026-04-14 12:00 |
11:04:22.83 |
+07:14:04.3 |
HIP 54182 |
11.31 |
| 2026-04-15 00:00 |
11:04:03.90 |
+07:19:00.2 |
HIP 54182 |
14.26 |
| 2026-04-15 12:00 |
11:03:45.13 |
+07:23:54.3 |
HIP 54057 |
11.06 |
| 2026-04-16 00:00 |
11:03:26.52 |
+07:28:46.7 |
HIP 54057 |
7.15 |