| Parameter |
Value |
| Designation |
C/2022 O1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-02-15T13:27:28.730880Z |
| Orbit solution date (soln_date, UTC) |
2023-12-21T03:13:05Z |
| Obs used |
189 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-07-26T03:07:23.577600Z |
| Discovery magnitude (MPC) |
19.32 c |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-10-15.0000000 |
| e |
1.00485234 |
| q (au) |
7.430031 |
| a (au) |
-1531.226453 |
| i (deg) |
71.044322 |
| Ω (om, deg) |
49.910226 |
| ω (w, deg) |
268.885126 |
| M (ma, deg) |
0.003971 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.639 + 3.878\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.639 |
| n |
3.878 |
| gf |
0.997 |
| gb |
-0.934 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
03:06:49.70 |
+03:21:53.6 |
HIP 14443 |
8.51 |
| 2026-05-12 12:00 |
03:06:58.63 |
+03:23:12.9 |
HIP 14443 |
11.04 |
| 2026-05-13 00:00 |
03:07:07.56 |
+03:24:31.8 |
HIP 14443 |
13.59 |
| 2026-05-13 12:00 |
03:07:16.48 |
+03:25:50.5 |
HIP 14443 |
16.14 |
| 2026-05-14 00:00 |
03:07:25.39 |
+03:27:08.8 |
HIP 14443 |
18.70 |
| 2026-05-14 12:00 |
03:07:34.31 |
+03:28:26.9 |
HIP 14443 |
21.26 |
| 2026-05-15 00:00 |
03:07:43.21 |
+03:29:44.6 |
HIP 14443 |
23.82 |
| 2026-05-15 12:00 |
03:07:52.11 |
+03:31:01.9 |
HIP 14644 |
26.35 |
| 2026-05-16 00:00 |
03:08:01.00 |
+03:32:19.0 |
HIP 14644 |
25.53 |
| 2026-05-16 12:00 |
03:08:09.88 |
+03:33:35.7 |
HIP 14644 |
24.95 |
| 2026-05-17 00:00 |
03:08:18.76 |
+03:34:52.1 |
HIP 14644 |
24.62 |
| 2026-05-17 12:00 |
03:08:27.62 |
+03:36:08.1 |
HIP 14644 |
24.54 |
| 2026-05-18 00:00 |
03:08:36.48 |
+03:37:23.9 |
HIP 14644 |
24.73 |
| 2026-05-18 12:00 |
03:08:45.33 |
+03:38:39.2 |
HIP 14644 |
25.17 |
| 2026-05-19 00:00 |
03:08:54.16 |
+03:39:54.3 |
HIP 14644 |
25.84 |
| 2026-05-19 12:00 |
03:09:02.99 |
+03:41:09.0 |
HIP 14644 |
26.74 |
| 2026-05-20 00:00 |
03:09:11.80 |
+03:42:23.4 |
HIP 14644 |
27.83 |
| 2026-05-20 12:00 |
03:09:20.60 |
+03:43:37.5 |
HIP 14644 |
29.10 |
| 2026-05-21 00:00 |
03:09:29.39 |
+03:44:51.2 |
HIP 14644 |
30.51 |
| 2026-05-21 12:00 |
03:09:38.17 |
+03:46:04.5 |
HIP 14746 |
31.70 |
| 2026-05-22 00:00 |
03:09:46.93 |
+03:47:17.6 |
HIP 14746 |
29.80 |
| 2026-05-22 12:00 |
03:09:55.67 |
+03:48:30.3 |
HIP 14746 |
28.00 |
| 2026-05-23 00:00 |
03:10:04.41 |
+03:49:42.6 |
HIP 14746 |
26.31 |
| 2026-05-23 12:00 |
03:10:13.12 |
+03:50:54.6 |
HIP 14746 |
24.78 |
| 2026-05-24 00:00 |
03:10:21.83 |
+03:52:06.3 |
HIP 14746 |
23.40 |
| 2026-05-24 12:00 |
03:10:30.51 |
+03:53:17.6 |
HIP 14746 |
22.23 |
| 2026-05-25 00:00 |
03:10:39.18 |
+03:54:28.6 |
HIP 14746 |
21.29 |
| 2026-05-25 12:00 |
03:10:47.83 |
+03:55:39.3 |
HIP 14746 |
20.60 |
| 2026-05-26 00:00 |
03:10:56.47 |
+03:56:49.6 |
HIP 14746 |
20.19 |
| 2026-05-26 12:00 |
03:11:05.09 |
+03:57:59.5 |
HIP 14746 |
20.09 |
| 2026-05-27 00:00 |
03:11:13.68 |
+03:59:09.1 |
HIP 14746 |
20.27 |
| 2026-05-27 12:00 |
03:11:22.26 |
+04:00:18.4 |
HIP 14937 |
18.66 |
| 2026-05-28 00:00 |
03:11:30.83 |
+04:01:27.3 |
HIP 14937 |
16.77 |
| 2026-05-28 12:00 |
03:11:39.37 |
+04:02:35.9 |
HIP 14937 |
15.04 |
| 2026-05-29 00:00 |
03:11:47.89 |
+04:03:44.1 |
HIP 14937 |
13.52 |
| 2026-05-29 12:00 |
03:11:56.39 |
+04:04:52.0 |
HIP 14937 |
12.30 |
| 2026-05-30 00:00 |
03:12:04.87 |
+04:05:59.5 |
HIP 14937 |
11.44 |
| 2026-05-30 12:00 |
03:12:13.33 |
+04:07:06.7 |
HIP 14937 |
11.05 |
| 2026-05-31 00:00 |
03:12:21.76 |
+04:08:13.5 |
HIP 14937 |
11.17 |
| 2026-05-31 12:00 |
03:12:30.18 |
+04:09:20.0 |
HIP 14937 |
11.77 |
| 2026-06-01 00:00 |
03:12:38.57 |
+04:10:26.2 |
HIP 14937 |
12.78 |
| 2026-06-01 12:00 |
03:12:46.94 |
+04:11:31.9 |
HIP 14937 |
14.12 |
| 2026-06-02 00:00 |
03:12:55.28 |
+04:12:37.4 |
HIP 14937 |
15.69 |