| 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 |
1.000 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
03:13:03.61 |
+04:13:42.5 |
HIP 14937 |
17.42 |
| 2026-06-03 00:00 |
03:13:11.90 |
+04:14:47.2 |
HIP 14937 |
19.28 |
| 2026-06-03 12:00 |
03:13:20.17 |
+04:15:51.6 |
HIP 14937 |
21.22 |
| 2026-06-04 00:00 |
03:13:28.42 |
+04:16:55.6 |
HIP 15115 |
21.78 |
| 2026-06-04 12:00 |
03:13:36.64 |
+04:17:59.3 |
HIP 15115 |
19.71 |
| 2026-06-05 00:00 |
03:13:44.84 |
+04:19:02.6 |
HIP 15115 |
17.69 |
| 2026-06-05 12:00 |
03:13:53.00 |
+04:20:05.5 |
HIP 15115 |
15.77 |
| 2026-06-06 00:00 |
03:14:01.15 |
+04:21:08.1 |
HIP 15115 |
13.95 |
| 2026-06-06 12:00 |
03:14:09.26 |
+04:22:10.4 |
HIP 15115 |
12.30 |
| 2026-06-07 00:00 |
03:14:17.34 |
+04:23:12.3 |
HIP 15115 |
10.88 |
| 2026-06-07 12:00 |
03:14:25.40 |
+04:24:13.8 |
HIP 15115 |
9.78 |
| 2026-06-08 00:00 |
03:14:33.43 |
+04:25:15.0 |
HIP 15115 |
9.12 |
| 2026-06-08 12:00 |
03:14:41.43 |
+04:26:15.8 |
HIP 15115 |
8.98 |
| 2026-06-09 00:00 |
03:14:49.40 |
+04:27:16.2 |
HIP 15115 |
9.39 |
| 2026-06-09 12:00 |
03:14:57.34 |
+04:28:16.3 |
HIP 15115 |
10.27 |
| 2026-06-10 00:00 |
03:15:05.24 |
+04:29:16.1 |
HIP 15115 |
11.51 |
| 2026-06-10 12:00 |
03:15:13.12 |
+04:30:15.4 |
HIP 15115 |
12.99 |
| 2026-06-11 00:00 |
03:15:20.96 |
+04:31:14.4 |
HIP 15115 |
14.65 |
| 2026-06-11 12:00 |
03:15:28.78 |
+04:32:13.1 |
HIP 15115 |
16.43 |
| 2026-06-12 00:00 |
03:15:36.56 |
+04:33:11.3 |
HIP 15115 |
18.28 |
| 2026-06-12 12:00 |
03:15:44.30 |
+04:34:09.3 |
HIP 15115 |
20.18 |
| 2026-06-13 00:00 |
03:15:52.01 |
+04:35:06.8 |
HIP 15115 |
22.13 |
| 2026-06-13 12:00 |
03:15:59.69 |
+04:36:04.0 |
HIP 15115 |
24.09 |
| 2026-06-14 00:00 |
03:16:07.33 |
+04:37:00.8 |
HIP 15253 |
26.01 |
| 2026-06-14 12:00 |
03:16:14.94 |
+04:37:57.2 |
HIP 15253 |
24.48 |
| 2026-06-15 00:00 |
03:16:22.51 |
+04:38:53.3 |
HIP 15253 |
23.05 |
| 2026-06-15 12:00 |
03:16:30.05 |
+04:39:49.0 |
HIP 15253 |
21.74 |
| 2026-06-16 00:00 |
03:16:37.55 |
+04:40:44.3 |
HIP 15253 |
20.57 |
| 2026-06-16 12:00 |
03:16:45.01 |
+04:41:39.3 |
HIP 15253 |
19.55 |
| 2026-06-17 00:00 |
03:16:52.43 |
+04:42:33.9 |
HIP 15253 |
18.72 |
| 2026-06-17 12:00 |
03:16:59.82 |
+04:43:28.1 |
HIP 15253 |
18.09 |
| 2026-06-18 00:00 |
03:17:07.16 |
+04:44:21.9 |
HIP 15253 |
17.67 |
| 2026-06-18 12:00 |
03:17:14.47 |
+04:45:15.4 |
HIP 15253 |
17.49 |
| 2026-06-19 00:00 |
03:17:21.73 |
+04:46:08.5 |
HIP 15365 |
16.39 |
| 2026-06-19 12:00 |
03:17:28.96 |
+04:47:01.3 |
HIP 15365 |
14.54 |
| 2026-06-20 00:00 |
03:17:36.14 |
+04:47:53.7 |
HIP 15365 |
12.75 |
| 2026-06-20 12:00 |
03:17:43.29 |
+04:48:45.7 |
HIP 15365 |
11.04 |
| 2026-06-21 00:00 |
03:17:50.39 |
+04:49:37.3 |
HIP 15365 |
9.44 |
| 2026-06-21 12:00 |
03:17:57.45 |
+04:50:28.6 |
HIP 15365 |
8.01 |
| 2026-06-22 00:00 |
03:18:04.47 |
+04:51:19.5 |
HIP 15365 |
6.86 |