C/2024 J3 (ATLAS)
| Parameter |
Value |
| Designation |
C/2024 J3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-11-25T07:55:46.456320Z |
| Orbit solution date (soln_date, UTC) |
2025-12-23T12:42:20Z |
| Obs used |
1089 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
7.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-05-06T06:21:33.667200Z |
| Discovery magnitude (MPC) |
17.60 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-05-08.0000000 |
| e |
1.00074993 |
| q (au) |
3.865158 |
| a (au) |
-5154.009792 |
| i (deg) |
75.639265 |
| Ω (om, deg) |
285.961230 |
| ω (w, deg) |
74.089022 |
| M (ma, deg) |
-0.001509 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.253 + 3.487\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.253 |
| n |
3.487 |
| gf |
0.978 |
| gb |
-0.844 |
| k |
1.000 |
| δ90 |
9.937 |
| 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) |
| 2026-02-03 00:00 |
19:39:40.90 |
+00:01:47.8 |
HIP 96749 |
21.51 |
| 2026-02-03 12:00 |
19:40:03.17 |
+00:06:25.3 |
HIP 96749 |
25.39 |
| 2026-02-04 00:00 |
19:40:25.43 |
+00:11:04.1 |
HIP 96749 |
30.55 |
| 2026-02-04 12:00 |
19:40:47.65 |
+00:15:44.2 |
HIP 96749 |
36.44 |
| 2026-02-05 00:00 |
19:41:09.85 |
+00:20:25.6 |
HIP 96629 |
39.06 |
| 2026-02-05 12:00 |
19:41:32.01 |
+00:25:08.4 |
HIP 97059 |
33.38 |
| 2026-02-06 00:00 |
19:41:54.15 |
+00:29:52.5 |
HIP 97059 |
26.34 |
| 2026-02-06 12:00 |
19:42:16.26 |
+00:34:37.9 |
HIP 97059 |
19.47 |
| 2026-02-07 00:00 |
19:42:38.33 |
+00:39:24.6 |
HIP 97059 |
13.08 |
| 2026-02-07 12:00 |
19:43:00.38 |
+00:44:12.7 |
HIP 97059 |
8.37 |
| 2026-02-08 00:00 |
19:43:22.39 |
+00:49:02.1 |
HIP 97059 |
8.73 |
| 2026-02-08 12:00 |
19:43:44.36 |
+00:53:52.8 |
HIP 97059 |
13.78 |
| 2026-02-09 00:00 |
19:44:06.30 |
+00:58:45.0 |
HIP 97177 |
19.97 |
| 2026-02-09 12:00 |
19:44:28.20 |
+01:03:38.4 |
HIP 97177 |
20.67 |
| 2026-02-10 00:00 |
19:44:50.07 |
+01:08:33.3 |
HIP 97177 |
23.76 |
| 2026-02-10 12:00 |
19:45:11.90 |
+01:13:29.4 |
HIP 97177 |
28.48 |
| 2026-02-11 00:00 |
19:45:33.69 |
+01:18:27.0 |
HIP 97384 |
32.64 |
| 2026-02-11 12:00 |
19:45:55.44 |
+01:23:25.9 |
HIP 97384 |
30.41 |
| 2026-02-12 00:00 |
19:46:17.15 |
+01:28:26.2 |
HIP 97418 |
26.82 |
| 2026-02-12 12:00 |
19:46:38.82 |
+01:33:27.9 |
HIP 97418 |
20.50 |
| 2026-02-13 00:00 |
19:47:00.45 |
+01:38:31.0 |
HIP 97418 |
15.20 |
| 2026-02-13 12:00 |
19:47:22.03 |
+01:43:35.4 |
HIP 97418 |
12.31 |
| 2026-02-14 00:00 |
19:47:43.57 |
+01:48:41.3 |
HIP 97418 |
13.50 |
| 2026-02-14 12:00 |
19:48:05.06 |
+01:53:48.5 |
HIP 97418 |
18.00 |
| 2026-02-15 00:00 |
19:48:26.50 |
+01:58:57.2 |
HIP 97418 |
24.01 |
| 2026-02-15 12:00 |
19:48:47.90 |
+02:04:07.2 |
HIP 97418 |
30.67 |
| 2026-02-16 00:00 |
19:49:09.25 |
+02:09:18.6 |
HIP 97418 |
37.64 |
| 2026-02-16 12:00 |
19:49:30.55 |
+02:14:31.5 |
HIP 97555 |
42.82 |
| 2026-02-17 00:00 |
19:49:51.80 |
+02:19:45.7 |
HIP 97555 |
37.54 |
| 2026-02-17 12:00 |
19:50:13.00 |
+02:25:01.4 |
HIP 97555 |
33.08 |
| 2026-02-18 00:00 |
19:50:34.14 |
+02:30:18.5 |
HIP 97555 |
29.81 |
| 2026-02-18 12:00 |
19:50:55.23 |
+02:35:37.0 |
HIP 97555 |
28.17 |
| 2026-02-19 00:00 |
19:51:16.27 |
+02:40:56.9 |
HIP 97555 |
28.44 |
| 2026-02-19 12:00 |
19:51:37.25 |
+02:46:18.2 |
HIP 97555 |
30.58 |
| 2026-02-20 00:00 |
19:51:58.18 |
+02:51:41.0 |
HIP 97555 |
34.23 |
| 2026-02-20 12:00 |
19:52:19.04 |
+02:57:05.2 |
HIP 97555 |
38.99 |
| 2026-02-21 00:00 |
19:52:39.85 |
+03:02:30.8 |
HIP 97555 |
44.50 |
| 2026-02-21 12:00 |
19:53:00.60 |
+03:07:57.9 |
HIP 98060 |
42.84 |
| 2026-02-22 00:00 |
19:53:21.29 |
+03:13:26.3 |
HIP 98060 |
36.34 |
| 2026-02-22 12:00 |
19:53:41.92 |
+03:18:56.3 |
HIP 98060 |
30.34 |
| 2026-02-23 00:00 |
19:54:02.48 |
+03:24:27.6 |
HIP 98060 |
25.20 |
| 2026-02-23 12:00 |
19:54:22.98 |
+03:30:00.4 |
HIP 98060 |
21.54 |
| 2026-02-24 00:00 |
19:54:43.42 |
+03:35:34.7 |
HIP 98060 |
20.21 |