| Parameter |
Value |
| Designation |
C/2022 Q2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-01-31T14:05:21.716160Z |
| Orbit solution date (soln_date, UTC) |
2023-08-06T18:13:02Z |
| Obs used |
591 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
9.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-08-27T14:05:17.059200Z |
| Discovery magnitude (MPC) |
19.06 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-11-02.0000000 |
| e |
0.94987994 |
| q (au) |
1.644140 |
| a (au) |
32.804037 |
| i (deg) |
151.486615 |
| Ω (om, deg) |
352.943256 |
| ω (w, deg) |
44.060185 |
| M (ma, deg) |
359.524797 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.015 + 3.982\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.015 |
| n |
3.982 |
| gf |
1.000 |
| gb |
-0.839 |
| k |
0.998 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-08-27 |
2022-12-21 |
+0.4118 |
-0.203 |
| 2023-04-03 |
2023-07-16 |
-8.5392 |
+4.736 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
11:11:42.35 |
+04:37:07.0 |
HIP 54810 |
24.12 |
| 2026-05-12 12:00 |
11:11:35.87 |
+04:37:33.9 |
HIP 54810 |
25.79 |
| 2026-05-13 00:00 |
11:11:29.49 |
+04:38:00.1 |
HIP 54810 |
27.44 |
| 2026-05-13 12:00 |
11:11:23.20 |
+04:38:25.8 |
HIP 54660 |
27.37 |
| 2026-05-14 00:00 |
11:11:17.01 |
+04:38:50.9 |
HIP 54660 |
26.96 |
| 2026-05-14 12:00 |
11:11:10.91 |
+04:39:15.4 |
HIP 54660 |
26.64 |
| 2026-05-15 00:00 |
11:11:04.92 |
+04:39:39.3 |
HIP 54660 |
26.42 |
| 2026-05-15 12:00 |
11:10:59.02 |
+04:40:02.7 |
HIP 54660 |
26.30 |
| 2026-05-16 00:00 |
11:10:53.22 |
+04:40:25.4 |
HIP 54660 |
26.26 |
| 2026-05-16 12:00 |
11:10:47.51 |
+04:40:47.6 |
HIP 54660 |
26.31 |
| 2026-05-17 00:00 |
11:10:41.91 |
+04:41:09.2 |
HIP 54660 |
26.44 |
| 2026-05-17 12:00 |
11:10:36.40 |
+04:41:30.2 |
HIP 54660 |
26.65 |
| 2026-05-18 00:00 |
11:10:30.99 |
+04:41:50.7 |
HIP 54660 |
26.93 |
| 2026-05-18 12:00 |
11:10:25.68 |
+04:42:10.5 |
HIP 54660 |
27.27 |
| 2026-05-19 00:00 |
11:10:20.46 |
+04:42:29.8 |
HIP 54660 |
27.67 |
| 2026-05-19 12:00 |
11:10:15.34 |
+04:42:48.5 |
HIP 54481 |
27.83 |
| 2026-05-20 00:00 |
11:10:10.32 |
+04:43:06.6 |
HIP 54481 |
26.65 |
| 2026-05-20 12:00 |
11:10:05.40 |
+04:43:24.1 |
HIP 54481 |
25.51 |
| 2026-05-21 00:00 |
11:10:00.57 |
+04:43:41.0 |
HIP 54481 |
24.41 |
| 2026-05-21 12:00 |
11:09:55.84 |
+04:43:57.4 |
HIP 54481 |
23.34 |
| 2026-05-22 00:00 |
11:09:51.21 |
+04:44:13.2 |
HIP 54481 |
22.31 |
| 2026-05-22 12:00 |
11:09:46.67 |
+04:44:28.4 |
HIP 54481 |
21.33 |
| 2026-05-23 00:00 |
11:09:42.23 |
+04:44:43.0 |
HIP 54481 |
20.38 |
| 2026-05-23 12:00 |
11:09:37.89 |
+04:44:57.0 |
HIP 54481 |
19.48 |
| 2026-05-24 00:00 |
11:09:33.64 |
+04:45:10.5 |
HIP 54481 |
18.62 |
| 2026-05-24 12:00 |
11:09:29.49 |
+04:45:23.4 |
HIP 54481 |
17.81 |
| 2026-05-25 00:00 |
11:09:25.44 |
+04:45:35.7 |
HIP 54481 |
17.05 |
| 2026-05-25 12:00 |
11:09:21.48 |
+04:45:47.5 |
HIP 54481 |
16.33 |
| 2026-05-26 00:00 |
11:09:17.62 |
+04:45:58.7 |
HIP 54481 |
15.67 |
| 2026-05-26 12:00 |
11:09:13.85 |
+04:46:09.3 |
HIP 54481 |
15.07 |
| 2026-05-27 00:00 |
11:09:10.17 |
+04:46:19.4 |
HIP 54481 |
14.52 |
| 2026-05-27 12:00 |
11:09:06.60 |
+04:46:28.9 |
HIP 54481 |
14.03 |
| 2026-05-28 00:00 |
11:09:03.11 |
+04:46:37.8 |
HIP 54481 |
13.59 |
| 2026-05-28 12:00 |
11:08:59.72 |
+04:46:46.2 |
HIP 54481 |
13.22 |
| 2026-05-29 00:00 |
11:08:56.43 |
+04:46:54.0 |
HIP 54481 |
12.90 |
| 2026-05-29 12:00 |
11:08:53.23 |
+04:47:01.2 |
HIP 54481 |
12.65 |
| 2026-05-30 00:00 |
11:08:50.12 |
+04:47:07.9 |
HIP 54481 |
12.45 |
| 2026-05-30 12:00 |
11:08:47.11 |
+04:47:14.0 |
HIP 54481 |
12.31 |
| 2026-05-31 00:00 |
11:08:44.18 |
+04:47:19.6 |
HIP 54481 |
12.23 |
| 2026-05-31 12:00 |
11:08:41.36 |
+04:47:24.6 |
HIP 54481 |
12.19 |
| 2026-06-01 00:00 |
11:08:38.62 |
+04:47:29.1 |
HIP 54481 |
12.20 |
| 2026-06-01 12:00 |
11:08:35.98 |
+04:47:33.0 |
HIP 54481 |
12.26 |
| 2026-06-02 00:00 |
11:08:33.43 |
+04:47:36.3 |
HIP 54481 |
12.35 |