C/2022 QE78 (ATLAS)
| Parameter |
Value |
| Designation |
C/2022 QE78 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-09-10T09:19:55.680960Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:19Z |
| Obs used |
2974 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-07-28.0000000 |
| e |
1.00423388 |
| q (au) |
5.478698 |
| a (au) |
-1294.012400 |
| i (deg) |
36.557022 |
| Ω (om, deg) |
119.929743 |
| ω (w, deg) |
0.415077 |
| M (ma, deg) |
-0.008668 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.370 + 2.379\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.370 |
| n |
2.379 |
| gf |
1.000 |
| gb |
-0.933 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:15:28.85 |
+28:02:12.5 |
HIP 45433 |
6.95 |
| 2026-02-03 12:00 |
09:15:17.15 |
+28:05:19.4 |
HIP 45433 |
10.61 |
| 2026-02-04 00:00 |
09:15:05.44 |
+28:08:25.4 |
HIP 45433 |
14.47 |
| 2026-02-04 12:00 |
09:14:53.71 |
+28:11:30.7 |
HIP 45433 |
18.39 |
| 2026-02-05 00:00 |
09:14:41.97 |
+28:14:35.1 |
HIP 45433 |
22.34 |
| 2026-02-05 12:00 |
09:14:30.23 |
+28:17:38.6 |
HIP 45433 |
26.29 |
| 2026-02-06 00:00 |
09:14:18.48 |
+28:20:41.2 |
HIP 45433 |
30.25 |
| 2026-02-06 12:00 |
09:14:06.73 |
+28:23:43.0 |
HIP 45433 |
34.20 |
| 2026-02-07 00:00 |
09:13:54.97 |
+28:26:43.8 |
HIP 45157 |
36.31 |
| 2026-02-07 12:00 |
09:13:43.23 |
+28:29:43.7 |
HIP 45157 |
32.37 |
| 2026-02-08 00:00 |
09:13:31.48 |
+28:32:42.7 |
HIP 45157 |
28.44 |
| 2026-02-08 12:00 |
09:13:19.75 |
+28:35:40.7 |
HIP 45157 |
24.53 |
| 2026-02-09 00:00 |
09:13:08.02 |
+28:38:37.7 |
HIP 45157 |
20.65 |
| 2026-02-09 12:00 |
09:12:56.31 |
+28:41:33.7 |
HIP 45157 |
16.78 |
| 2026-02-10 00:00 |
09:12:44.62 |
+28:44:28.7 |
HIP 45157 |
12.96 |
| 2026-02-10 12:00 |
09:12:32.95 |
+28:47:22.7 |
HIP 45157 |
9.20 |
| 2026-02-11 00:00 |
09:12:21.30 |
+28:50:15.7 |
HIP 45157 |
5.61 |
| 2026-02-11 12:00 |
09:12:09.68 |
+28:53:07.6 |
HIP 45157 |
2.81 |
| 2026-02-12 00:00 |
09:11:58.08 |
+28:55:58.4 |
HIP 45157 |
3.68 |
| 2026-02-12 12:00 |
09:11:46.52 |
+28:58:48.1 |
HIP 45157 |
6.93 |
| 2026-02-13 00:00 |
09:11:34.99 |
+29:01:36.8 |
HIP 45157 |
10.53 |
| 2026-02-13 12:00 |
09:11:23.49 |
+29:04:24.3 |
HIP 45049 |
11.15 |
| 2026-02-14 00:00 |
09:11:12.04 |
+29:07:10.7 |
HIP 45049 |
9.13 |
| 2026-02-14 12:00 |
09:11:00.62 |
+29:09:56.0 |
HIP 45049 |
8.39 |
| 2026-02-15 00:00 |
09:10:49.26 |
+29:12:40.1 |
HIP 45049 |
9.21 |
| 2026-02-15 12:00 |
09:10:37.94 |
+29:15:23.0 |
HIP 45049 |
11.23 |
| 2026-02-16 00:00 |
09:10:26.67 |
+29:18:04.8 |
HIP 45049 |
13.92 |
| 2026-02-16 12:00 |
09:10:15.46 |
+29:20:45.3 |
HIP 45049 |
16.95 |
| 2026-02-17 00:00 |
09:10:04.30 |
+29:23:24.7 |
HIP 45049 |
20.15 |
| 2026-02-17 12:00 |
09:09:53.20 |
+29:26:02.8 |
HIP 45049 |
23.45 |
| 2026-02-18 00:00 |
09:09:42.16 |
+29:28:39.8 |
HIP 44818 |
24.60 |
| 2026-02-18 12:00 |
09:09:31.19 |
+29:31:15.5 |
HIP 44818 |
21.36 |
| 2026-02-19 00:00 |
09:09:20.29 |
+29:33:49.9 |
HIP 44818 |
18.26 |
| 2026-02-19 12:00 |
09:09:09.46 |
+29:36:23.1 |
HIP 44818 |
15.35 |
| 2026-02-20 00:00 |
09:08:58.70 |
+29:38:55.0 |
HIP 44818 |
12.74 |
| 2026-02-20 12:00 |
09:08:48.01 |
+29:41:25.6 |
HIP 44818 |
10.64 |
| 2026-02-21 00:00 |
09:08:37.41 |
+29:43:55.0 |
HIP 44818 |
9.35 |
| 2026-02-21 12:00 |
09:08:26.88 |
+29:46:23.0 |
HIP 44818 |
9.20 |
| 2026-02-22 00:00 |
09:08:16.44 |
+29:48:49.8 |
HIP 44818 |
10.21 |
| 2026-02-22 12:00 |
09:08:06.08 |
+29:51:15.2 |
HIP 44818 |
12.07 |
| 2026-02-23 00:00 |
09:07:55.82 |
+29:53:39.3 |
HIP 44818 |
14.43 |
| 2026-02-23 12:00 |
09:07:45.64 |
+29:56:02.1 |
HIP 44818 |
17.07 |
| 2026-02-24 00:00 |
09:07:35.56 |
+29:58:23.6 |
HIP 44818 |
19.86 |