| 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) |
| 2026-07-29 00:00 |
03:24:17.90 |
+05:37:14.7 |
HIP 16003 |
27.10 |
| 2026-07-29 12:00 |
03:24:20.61 |
+05:37:38.6 |
HIP 16003 |
26.51 |
| 2026-07-30 00:00 |
03:24:23.25 |
+05:38:02.3 |
HIP 16003 |
25.96 |
| 2026-07-30 12:00 |
03:24:25.81 |
+05:38:25.6 |
HIP 16003 |
25.43 |
| 2026-07-31 00:00 |
03:24:28.30 |
+05:38:48.5 |
HIP 16003 |
24.93 |
| 2026-07-31 12:00 |
03:24:30.73 |
+05:39:11.2 |
HIP 16003 |
24.46 |
| 2026-08-01 00:00 |
03:24:33.08 |
+05:39:33.5 |
HIP 16003 |
24.01 |
| 2026-08-01 12:00 |
03:24:35.35 |
+05:39:55.5 |
HIP 15978 |
23.58 |
| 2026-08-02 00:00 |
03:24:37.56 |
+05:40:17.1 |
HIP 15978 |
22.93 |
| 2026-08-02 12:00 |
03:24:39.69 |
+05:40:38.5 |
HIP 15978 |
22.31 |
| 2026-08-03 00:00 |
03:24:41.75 |
+05:40:59.5 |
HIP 15978 |
21.69 |
| 2026-08-03 12:00 |
03:24:43.74 |
+05:41:20.2 |
HIP 15978 |
21.10 |
| 2026-08-04 00:00 |
03:24:45.65 |
+05:41:40.5 |
HIP 15978 |
20.52 |
| 2026-08-04 12:00 |
03:24:47.49 |
+05:42:00.6 |
HIP 15978 |
19.96 |
| 2026-08-05 00:00 |
03:24:49.26 |
+05:42:20.3 |
HIP 15978 |
19.42 |
| 2026-08-05 12:00 |
03:24:50.95 |
+05:42:39.7 |
HIP 15978 |
18.89 |
| 2026-08-06 00:00 |
03:24:52.56 |
+05:42:58.7 |
HIP 15978 |
18.39 |
| 2026-08-06 12:00 |
03:24:54.11 |
+05:43:17.5 |
HIP 15978 |
17.89 |
| 2026-08-07 00:00 |
03:24:55.57 |
+05:43:35.9 |
HIP 15978 |
17.42 |
| 2026-08-07 12:00 |
03:24:56.96 |
+05:43:54.0 |
HIP 15978 |
16.96 |
| 2026-08-08 00:00 |
03:24:58.28 |
+05:44:11.8 |
HIP 15978 |
16.52 |
| 2026-08-08 12:00 |
03:24:59.51 |
+05:44:29.3 |
HIP 15978 |
16.10 |
| 2026-08-09 00:00 |
03:25:00.68 |
+05:44:46.5 |
HIP 15978 |
15.69 |
| 2026-08-09 12:00 |
03:25:01.76 |
+05:45:03.3 |
HIP 15978 |
15.30 |
| 2026-08-10 00:00 |
03:25:02.77 |
+05:45:19.9 |
HIP 15978 |
14.93 |
| 2026-08-10 12:00 |
03:25:03.70 |
+05:45:36.1 |
HIP 15978 |
14.57 |
| 2026-08-11 00:00 |
03:25:04.55 |
+05:45:52.1 |
HIP 15978 |
14.24 |
| 2026-08-11 12:00 |
03:25:05.33 |
+05:46:07.7 |
HIP 15978 |
13.91 |
| 2026-08-12 00:00 |
03:25:06.03 |
+05:46:23.0 |
HIP 15978 |
13.61 |
| 2026-08-12 12:00 |
03:25:06.65 |
+05:46:38.0 |
HIP 15978 |
13.32 |
| 2026-08-13 00:00 |
03:25:07.19 |
+05:46:52.7 |
HIP 15978 |
13.05 |
| 2026-08-13 12:00 |
03:25:07.65 |
+05:47:07.2 |
HIP 15978 |
12.80 |
| 2026-08-14 00:00 |
03:25:08.04 |
+05:47:21.3 |
HIP 15978 |
12.57 |
| 2026-08-14 12:00 |
03:25:08.34 |
+05:47:35.1 |
HIP 15978 |
12.35 |
| 2026-08-15 00:00 |
03:25:08.57 |
+05:47:48.7 |
HIP 15978 |
12.16 |
| 2026-08-15 12:00 |
03:25:08.72 |
+05:48:01.9 |
HIP 15978 |
11.98 |
| 2026-08-16 00:00 |
03:25:08.79 |
+05:48:14.9 |
HIP 15978 |
11.82 |
| 2026-08-16 12:00 |
03:25:08.78 |
+05:48:27.5 |
HIP 15978 |
11.69 |
| 2026-08-17 00:00 |
03:25:08.69 |
+05:48:39.9 |
HIP 15978 |
11.57 |
| 2026-08-17 12:00 |
03:25:08.52 |
+05:48:52.0 |
HIP 15978 |
11.47 |
| 2026-08-18 00:00 |
03:25:08.27 |
+05:49:03.9 |
HIP 15978 |
11.40 |
| 2026-08-18 12:00 |
03:25:07.94 |
+05:49:15.4 |
HIP 15978 |
11.34 |
| 2026-08-19 00:00 |
03:25:07.53 |
+05:49:26.7 |
HIP 15978 |
11.31 |