| Parameter |
Value |
| Designation |
C/2023 F3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-02-02T14:59:22.727040Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:18Z |
| Obs used |
1163 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-03-28T08:28:27.840000Z |
| Discovery magnitude (MPC) |
18.85 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-03-12.0000000 |
| e |
1.00362990 |
| q (au) |
5.190775 |
| a (au) |
-1430.004816 |
| i (deg) |
145.963583 |
| Ω (om, deg) |
109.464314 |
| ω (w, deg) |
265.531090 |
| M (ma, deg) |
0.000681 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.833 + 3.042\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.833 |
| n |
3.042 |
| gf |
0.821 |
| gb |
-0.780 |
| k |
0.880 |
| δ90 |
5.069 |
| 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) |
| 2026-03-26 00:00 |
09:20:30.79 |
-15:26:46.3 |
HIP 45854 |
11.88 |
| 2026-03-26 12:00 |
09:20:07.86 |
-15:21:29.4 |
HIP 45854 |
19.33 |
| 2026-03-27 00:00 |
09:19:45.15 |
-15:16:12.7 |
HIP 45854 |
26.86 |
| 2026-03-27 12:00 |
09:19:22.66 |
-15:10:56.3 |
HIP 45854 |
34.38 |
| 2026-03-28 00:00 |
09:19:00.38 |
-15:05:40.2 |
HIP 45552 |
37.70 |
| 2026-03-28 12:00 |
09:18:38.33 |
-15:00:24.4 |
HIP 45559 |
33.97 |
| 2026-03-29 00:00 |
09:18:16.49 |
-14:55:08.9 |
HIP 45559 |
26.55 |
| 2026-03-29 12:00 |
09:17:54.88 |
-14:49:53.8 |
HIP 45559 |
19.20 |
| 2026-03-30 00:00 |
09:17:33.48 |
-14:44:39.0 |
HIP 45559 |
11.96 |
| 2026-03-30 12:00 |
09:17:12.31 |
-14:39:24.7 |
HIP 45559 |
5.09 |
| 2026-03-31 00:00 |
09:16:51.35 |
-14:34:10.9 |
HIP 45559 |
3.97 |
| 2026-03-31 12:00 |
09:16:30.62 |
-14:28:57.5 |
HIP 45559 |
10.52 |
| 2026-04-01 00:00 |
09:16:10.10 |
-14:23:44.5 |
HIP 45559 |
17.58 |
| 2026-04-01 12:00 |
09:15:49.81 |
-14:18:32.1 |
HIP 45559 |
24.68 |
| 2026-04-02 00:00 |
09:15:29.75 |
-14:13:20.3 |
HIP 45511 |
27.19 |
| 2026-04-02 12:00 |
09:15:09.90 |
-14:08:09.0 |
HIP 45263 |
25.81 |
| 2026-04-03 00:00 |
09:14:50.27 |
-14:02:58.3 |
HIP 45263 |
24.25 |
| 2026-04-03 12:00 |
09:14:30.87 |
-13:57:48.2 |
HIP 45263 |
24.69 |
| 2026-04-04 00:00 |
09:14:11.69 |
-13:52:38.8 |
HIP 45263 |
27.00 |
| 2026-04-04 12:00 |
09:13:52.74 |
-13:47:30.0 |
HIP 45263 |
30.74 |
| 2026-04-05 00:00 |
09:13:34.00 |
-13:42:21.9 |
HIP 45263 |
35.43 |
| 2026-04-05 12:00 |
09:13:15.49 |
-13:37:14.5 |
HIP 45263 |
40.72 |
| 2026-04-06 00:00 |
09:12:57.20 |
-13:32:07.8 |
HIP 45263 |
46.39 |
| 2026-04-06 12:00 |
09:12:39.14 |
-13:27:01.9 |
HIP 45445 |
48.22 |
| 2026-04-07 00:00 |
09:12:21.30 |
-13:21:56.7 |
HIP 45078 |
47.30 |
| 2026-04-07 12:00 |
09:12:03.68 |
-13:16:52.4 |
HIP 45078 |
40.91 |
| 2026-04-08 00:00 |
09:11:46.28 |
-13:11:48.8 |
HIP 45078 |
34.64 |
| 2026-04-08 12:00 |
09:11:29.11 |
-13:06:46.1 |
HIP 45078 |
28.54 |
| 2026-04-09 00:00 |
09:11:12.16 |
-13:01:44.2 |
HIP 45078 |
22.72 |
| 2026-04-09 12:00 |
09:10:55.43 |
-12:56:43.2 |
HIP 45078 |
17.41 |
| 2026-04-10 00:00 |
09:10:38.93 |
-12:51:43.1 |
HIP 45078 |
13.17 |
| 2026-04-10 12:00 |
09:10:22.64 |
-12:46:43.9 |
HIP 45078 |
11.21 |
| 2026-04-11 00:00 |
09:10:06.58 |
-12:41:45.6 |
HIP 45078 |
12.56 |
| 2026-04-11 12:00 |
09:09:50.74 |
-12:36:48.3 |
HIP 45078 |
16.38 |
| 2026-04-12 00:00 |
09:09:35.12 |
-12:31:52.0 |
HIP 44936 |
11.89 |
| 2026-04-12 12:00 |
09:09:19.73 |
-12:26:56.6 |
HIP 44936 |
5.84 |
| 2026-04-13 00:00 |
09:09:04.55 |
-12:22:02.2 |
HIP 44936 |
1.79 |
| 2026-04-13 12:00 |
09:08:49.60 |
-12:17:08.9 |
HIP 44936 |
6.87 |
| 2026-04-14 00:00 |
09:08:34.86 |
-12:12:16.6 |
HIP 44807 |
12.36 |
| 2026-04-14 12:00 |
09:08:20.35 |
-12:07:25.3 |
HIP 44793 |
10.88 |
| 2026-04-15 00:00 |
09:08:06.05 |
-12:02:35.2 |
HIP 44793 |
5.63 |
| 2026-04-15 12:00 |
09:07:51.98 |
-11:57:46.1 |
HIP 44793 |
4.02 |
| 2026-04-16 00:00 |
09:07:38.12 |
-11:52:58.1 |
HIP 44793 |
8.39 |