| Parameter |
Value |
| Designation |
C/2022 N1 (Attard-Maury) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-09-10T01:06:56.952000Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:22Z |
| Obs used |
222 |
| NEO |
- |
| M1 |
17.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-07-02T07:43:58.080000Z |
| Discovery magnitude (MPC) |
17.20 G |
| Discovery observatory (MPC) |
W94 · MAPS, San Pedro de Atacama |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-08-01.0000000 |
| e |
0.96002870 |
| q (au) |
1.481828 |
| a (au) |
37.072286 |
| i (deg) |
164.740998 |
| Ω (om, deg) |
301.858165 |
| ω (w, deg) |
41.069648 |
| M (ma, deg) |
359.825138 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.829 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.829 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.908 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:16:00.19 |
+18:46:25.3 |
HIP 40483 |
4.80 |
| 2026-09-20 12:00 |
08:16:03.89 |
+18:46:06.2 |
HIP 40483 |
4.65 |
| 2026-09-21 00:00 |
08:16:07.52 |
+18:45:47.2 |
HIP 40483 |
4.67 |
| 2026-09-21 12:00 |
08:16:11.09 |
+18:45:28.5 |
HIP 40483 |
4.87 |
| 2026-09-22 00:00 |
08:16:14.59 |
+18:45:09.9 |
HIP 40483 |
5.20 |
| 2026-09-22 12:00 |
08:16:18.03 |
+18:44:51.5 |
HIP 40483 |
5.65 |
| 2026-09-23 00:00 |
08:16:21.40 |
+18:44:33.3 |
HIP 40483 |
6.17 |
| 2026-09-23 12:00 |
08:16:24.71 |
+18:44:15.3 |
HIP 40483 |
6.75 |
| 2026-09-24 00:00 |
08:16:27.95 |
+18:43:57.6 |
HIP 40483 |
7.36 |
| 2026-09-24 12:00 |
08:16:31.12 |
+18:43:40.0 |
HIP 40483 |
8.00 |
| 2026-09-25 00:00 |
08:16:34.23 |
+18:43:22.6 |
HIP 40483 |
8.65 |
| 2026-09-25 12:00 |
08:16:37.27 |
+18:43:05.4 |
HIP 40483 |
9.31 |
| 2026-09-26 00:00 |
08:16:40.24 |
+18:42:48.4 |
HIP 40483 |
9.96 |
| 2026-09-26 12:00 |
08:16:43.14 |
+18:42:31.6 |
HIP 40483 |
10.62 |
| 2026-09-27 00:00 |
08:16:45.97 |
+18:42:15.0 |
HIP 40483 |
11.27 |
| 2026-09-27 12:00 |
08:16:48.74 |
+18:41:58.6 |
HIP 40483 |
11.91 |
| 2026-09-28 00:00 |
08:16:51.43 |
+18:41:42.4 |
HIP 40483 |
12.55 |
| 2026-09-28 12:00 |
08:16:54.06 |
+18:41:26.5 |
HIP 40483 |
13.17 |
| 2026-09-29 00:00 |
08:16:56.61 |
+18:41:10.7 |
HIP 40483 |
13.78 |
| 2026-09-29 12:00 |
08:16:59.09 |
+18:40:55.2 |
HIP 40483 |
14.38 |
| 2026-09-30 00:00 |
08:17:01.51 |
+18:40:39.8 |
HIP 40483 |
14.96 |
| 2026-09-30 12:00 |
08:17:03.85 |
+18:40:24.7 |
HIP 40483 |
15.54 |
| 2026-10-01 00:00 |
08:17:06.12 |
+18:40:09.8 |
HIP 40483 |
16.09 |
| 2026-10-01 12:00 |
08:17:08.32 |
+18:39:55.2 |
HIP 40483 |
16.63 |
| 2026-10-02 00:00 |
08:17:10.44 |
+18:39:40.7 |
HIP 40483 |
17.16 |
| 2026-10-02 12:00 |
08:17:12.49 |
+18:39:26.5 |
HIP 40483 |
17.67 |
| 2026-10-03 00:00 |
08:17:14.47 |
+18:39:12.4 |
HIP 40483 |
18.17 |
| 2026-10-03 12:00 |
08:17:16.38 |
+18:38:58.7 |
HIP 40483 |
18.65 |
| 2026-10-04 00:00 |
08:17:18.21 |
+18:38:45.1 |
HIP 40483 |
19.11 |
| 2026-10-04 12:00 |
08:17:19.96 |
+18:38:31.8 |
HIP 40483 |
19.55 |
| 2026-10-05 00:00 |
08:17:21.64 |
+18:38:18.6 |
HIP 40483 |
19.98 |
| 2026-10-05 12:00 |
08:17:23.25 |
+18:38:05.8 |
HIP 40483 |
20.39 |
| 2026-10-06 00:00 |
08:17:24.78 |
+18:37:53.1 |
HIP 40483 |
20.79 |
| 2026-10-06 12:00 |
08:17:26.23 |
+18:37:40.7 |
HIP 40483 |
21.16 |
| 2026-10-07 00:00 |
08:17:27.61 |
+18:37:28.5 |
HIP 40483 |
21.52 |
| 2026-10-07 12:00 |
08:17:28.91 |
+18:37:16.6 |
HIP 40483 |
21.86 |
| 2026-10-08 00:00 |
08:17:30.13 |
+18:37:04.9 |
HIP 40483 |
22.19 |
| 2026-10-08 12:00 |
08:17:31.27 |
+18:36:53.5 |
HIP 40483 |
22.49 |
| 2026-10-09 00:00 |
08:17:32.34 |
+18:36:42.3 |
HIP 40483 |
22.78 |
| 2026-10-09 12:00 |
08:17:33.33 |
+18:36:31.3 |
HIP 40483 |
23.05 |
| 2026-10-10 00:00 |
08:17:34.24 |
+18:36:20.6 |
HIP 40483 |
23.30 |
| 2026-10-10 12:00 |
08:17:35.07 |
+18:36:10.1 |
HIP 40483 |
23.53 |
| 2026-10-11 00:00 |
08:17:35.82 |
+18:35:59.9 |
HIP 40483 |
23.74 |