| Parameter |
Value |
| Designation |
C/2023 F3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-02-02T15:01:13.872000Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:15Z |
| Obs used |
1326 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
5.500 |
| PC |
0.030 |
| 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) |
2025-05-04.0000000 |
| e |
1.00348053 |
| q (au) |
5.190776 |
| a (au) |
-1491.376648 |
| i (deg) |
145.963569 |
| Ω (om, deg) |
109.464718 |
| ω (w, deg) |
265.531839 |
| M (ma, deg) |
0.001547 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.945 + 3.027\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.945 |
| n |
3.027 |
| gf |
0.957 |
| gb |
-0.729 |
| k |
0.800 |
| 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 |
08:59:56.45 |
-06:08:48.5 |
HIP 44273 |
16.38 |
| 2026-06-01 12:00 |
08:59:58.68 |
-06:06:11.3 |
HIP 44273 |
17.27 |
| 2026-06-02 00:00 |
09:00:01.04 |
-06:03:35.5 |
HIP 44119 |
18.46 |
| 2026-06-02 12:00 |
09:00:03.51 |
-06:01:01.1 |
HIP 44119 |
17.24 |
| 2026-06-03 00:00 |
09:00:06.10 |
-05:58:28.1 |
HIP 44119 |
16.39 |
| 2026-06-03 12:00 |
09:00:08.80 |
-05:55:56.5 |
HIP 44119 |
15.98 |
| 2026-06-04 00:00 |
09:00:11.63 |
-05:53:26.2 |
HIP 44119 |
16.01 |
| 2026-06-04 12:00 |
09:00:14.56 |
-05:50:57.4 |
HIP 44119 |
16.49 |
| 2026-06-05 00:00 |
09:00:17.61 |
-05:48:29.8 |
HIP 44119 |
17.38 |
| 2026-06-05 12:00 |
09:00:20.77 |
-05:46:03.7 |
HIP 44119 |
18.60 |
| 2026-06-06 00:00 |
09:00:24.04 |
-05:43:38.9 |
HIP 44119 |
20.09 |
| 2026-06-06 12:00 |
09:00:27.42 |
-05:41:15.5 |
HIP 44119 |
21.80 |
| 2026-06-07 00:00 |
09:00:30.91 |
-05:38:53.4 |
HIP 44119 |
23.66 |
| 2026-06-07 12:00 |
09:00:34.51 |
-05:36:32.7 |
HIP 44119 |
25.65 |
| 2026-06-08 00:00 |
09:00:38.22 |
-05:34:13.4 |
HIP 44372 |
24.79 |
| 2026-06-08 12:00 |
09:00:42.03 |
-05:31:55.4 |
HIP 44372 |
23.32 |
| 2026-06-09 00:00 |
09:00:45.95 |
-05:29:38.7 |
HIP 44372 |
22.00 |
| 2026-06-09 12:00 |
09:00:49.97 |
-05:27:23.3 |
HIP 44372 |
20.88 |
| 2026-06-10 00:00 |
09:00:54.09 |
-05:25:09.3 |
HIP 44372 |
19.96 |
| 2026-06-10 12:00 |
09:00:58.32 |
-05:22:56.6 |
HIP 44372 |
19.29 |
| 2026-06-11 00:00 |
09:01:02.65 |
-05:20:45.3 |
HIP 44372 |
18.89 |
| 2026-06-11 12:00 |
09:01:07.07 |
-05:18:35.2 |
HIP 44372 |
18.76 |
| 2026-06-12 00:00 |
09:01:11.60 |
-05:16:26.5 |
HIP 44372 |
18.91 |
| 2026-06-12 12:00 |
09:01:16.22 |
-05:14:19.0 |
HIP 44372 |
19.33 |
| 2026-06-13 00:00 |
09:01:20.94 |
-05:12:12.9 |
HIP 44372 |
20.01 |
| 2026-06-13 12:00 |
09:01:25.76 |
-05:10:08.1 |
HIP 44372 |
20.91 |
| 2026-06-14 00:00 |
09:01:30.67 |
-05:08:04.6 |
HIP 44372 |
22.01 |
| 2026-06-14 12:00 |
09:01:35.67 |
-05:06:02.4 |
HIP 44372 |
23.27 |
| 2026-06-15 00:00 |
09:01:40.77 |
-05:04:01.4 |
HIP 44372 |
24.67 |
| 2026-06-15 12:00 |
09:01:45.95 |
-05:02:01.8 |
HIP 44372 |
26.19 |
| 2026-06-16 00:00 |
09:01:51.23 |
-05:00:03.4 |
HIP 44372 |
27.80 |
| 2026-06-16 12:00 |
09:01:56.60 |
-04:58:06.3 |
HIP 44476 |
29.26 |
| 2026-06-17 00:00 |
09:02:02.05 |
-04:56:10.5 |
HIP 44476 |
28.92 |
| 2026-06-17 12:00 |
09:02:07.59 |
-04:54:15.9 |
HIP 44316 |
28.38 |
| 2026-06-18 00:00 |
09:02:13.22 |
-04:52:22.6 |
HIP 44316 |
27.10 |
| 2026-06-18 12:00 |
09:02:18.93 |
-04:50:30.5 |
HIP 44316 |
26.01 |
| 2026-06-19 00:00 |
09:02:24.72 |
-04:48:39.6 |
HIP 44316 |
25.11 |
| 2026-06-19 12:00 |
09:02:30.60 |
-04:46:50.0 |
HIP 44450 |
23.92 |
| 2026-06-20 00:00 |
09:02:36.56 |
-04:45:01.7 |
HIP 44450 |
21.61 |
| 2026-06-20 12:00 |
09:02:42.59 |
-04:43:14.5 |
HIP 44450 |
19.30 |
| 2026-06-21 00:00 |
09:02:48.71 |
-04:41:28.6 |
HIP 44450 |
17.02 |
| 2026-06-21 12:00 |
09:02:54.90 |
-04:39:43.9 |
HIP 44450 |
14.76 |
| 2026-06-22 00:00 |
09:03:01.18 |
-04:38:00.4 |
HIP 44450 |
12.54 |