| 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) |
| 2026-07-29 00:00 |
11:12:18.14 |
+04:02:04.6 |
HIP 54810 |
30.20 |
| 2026-07-29 12:00 |
11:12:23.65 |
+04:01:18.8 |
HIP 54810 |
30.29 |
| 2026-07-30 00:00 |
11:12:29.20 |
+04:00:32.8 |
HIP 54810 |
30.46 |
| 2026-07-30 12:00 |
11:12:34.79 |
+03:59:46.4 |
HIP 54810 |
30.72 |
| 2026-07-31 00:00 |
11:12:40.42 |
+03:58:59.8 |
HIP 54886 |
30.81 |
| 2026-07-31 12:00 |
11:12:46.09 |
+03:58:13.0 |
HIP 54886 |
30.20 |
| 2026-08-01 00:00 |
11:12:51.80 |
+03:57:25.8 |
HIP 54886 |
29.66 |
| 2026-08-01 12:00 |
11:12:57.56 |
+03:56:38.4 |
HIP 54886 |
29.20 |
| 2026-08-02 00:00 |
11:13:03.35 |
+03:55:50.8 |
HIP 54886 |
28.82 |
| 2026-08-02 12:00 |
11:13:09.18 |
+03:55:02.9 |
HIP 54886 |
28.53 |
| 2026-08-03 00:00 |
11:13:15.05 |
+03:54:14.7 |
HIP 54886 |
28.33 |
| 2026-08-03 12:00 |
11:13:20.96 |
+03:53:26.3 |
HIP 54886 |
28.23 |
| 2026-08-04 00:00 |
11:13:26.90 |
+03:52:37.7 |
HIP 54853 |
27.77 |
| 2026-08-04 12:00 |
11:13:32.89 |
+03:51:48.8 |
HIP 54853 |
26.69 |
| 2026-08-05 00:00 |
11:13:38.91 |
+03:50:59.6 |
HIP 54853 |
25.68 |
| 2026-08-05 12:00 |
11:13:44.96 |
+03:50:10.3 |
HIP 54853 |
24.74 |
| 2026-08-06 00:00 |
11:13:51.06 |
+03:49:20.6 |
HIP 54853 |
23.88 |
| 2026-08-06 12:00 |
11:13:57.18 |
+03:48:30.8 |
HIP 54853 |
23.11 |
| 2026-08-07 00:00 |
11:14:03.35 |
+03:47:40.7 |
HIP 54853 |
22.45 |
| 2026-08-07 12:00 |
11:14:09.54 |
+03:46:50.4 |
HIP 54853 |
21.91 |
| 2026-08-08 00:00 |
11:14:15.77 |
+03:45:59.8 |
HIP 54853 |
21.50 |
| 2026-08-08 12:00 |
11:14:22.04 |
+03:45:09.1 |
HIP 54853 |
21.23 |
| 2026-08-09 00:00 |
11:14:28.34 |
+03:44:18.1 |
HIP 54853 |
21.10 |
| 2026-08-09 12:00 |
11:14:34.67 |
+03:43:26.9 |
HIP 54853 |
21.13 |
| 2026-08-10 00:00 |
11:14:41.03 |
+03:42:35.5 |
HIP 54853 |
21.31 |
| 2026-08-10 12:00 |
11:14:47.42 |
+03:41:43.9 |
HIP 54853 |
21.64 |
| 2026-08-11 00:00 |
11:14:53.85 |
+03:40:52.0 |
HIP 54853 |
22.12 |
| 2026-08-11 12:00 |
11:15:00.30 |
+03:40:00.0 |
HIP 54853 |
22.74 |
| 2026-08-12 00:00 |
11:15:06.79 |
+03:39:07.7 |
HIP 54853 |
23.50 |
| 2026-08-12 12:00 |
11:15:13.30 |
+03:38:15.3 |
HIP 54853 |
24.37 |
| 2026-08-13 00:00 |
11:15:19.84 |
+03:37:22.6 |
HIP 54853 |
25.35 |
| 2026-08-13 12:00 |
11:15:26.41 |
+03:36:29.8 |
HIP 54853 |
26.43 |
| 2026-08-14 00:00 |
11:15:33.01 |
+03:35:36.8 |
HIP 54853 |
27.59 |
| 2026-08-14 12:00 |
11:15:39.63 |
+03:34:43.6 |
HIP 54853 |
28.84 |
| 2026-08-15 00:00 |
11:15:46.29 |
+03:33:50.2 |
HIP 55102 |
28.85 |
| 2026-08-15 12:00 |
11:15:52.96 |
+03:32:56.6 |
HIP 55102 |
28.66 |
| 2026-08-16 00:00 |
11:15:59.66 |
+03:32:02.9 |
HIP 55102 |
28.59 |
| 2026-08-16 12:00 |
11:16:06.39 |
+03:31:09.0 |
HIP 55102 |
28.65 |
| 2026-08-17 00:00 |
11:16:13.14 |
+03:30:14.9 |
HIP 55102 |
28.84 |
| 2026-08-17 12:00 |
11:16:19.92 |
+03:29:20.7 |
HIP 55102 |
29.15 |
| 2026-08-18 00:00 |
11:16:26.72 |
+03:28:26.2 |
HIP 55102 |
29.58 |
| 2026-08-18 12:00 |
11:16:33.54 |
+03:27:31.7 |
HIP 55102 |
30.14 |
| 2026-08-19 00:00 |
11:16:40.38 |
+03:26:36.9 |
HIP 55102 |
30.80 |