C/2022 N1 (Attard-Maury)
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-06-29 |
2022-08-27 |
+8.6296 |
-1.909 |
| 2022-09-19 |
2025-02-02 |
-1.8329 |
-1.880 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:06:58.12 |
+19:56:25.3 |
HIP 39749 |
9.87 |
| 2026-02-03 12:00 |
08:06:44.15 |
+19:57:00.2 |
HIP 39749 |
12.67 |
| 2026-02-04 00:00 |
08:06:30.23 |
+19:57:34.9 |
HIP 39749 |
15.66 |
| 2026-02-04 12:00 |
08:06:16.34 |
+19:58:09.5 |
HIP 39749 |
18.76 |
| 2026-02-05 00:00 |
08:06:02.50 |
+19:58:43.9 |
HIP 39749 |
21.91 |
| 2026-02-05 12:00 |
08:05:48.71 |
+19:59:18.1 |
HIP 39548 |
19.72 |
| 2026-02-06 00:00 |
08:05:34.96 |
+19:59:52.0 |
HIP 39548 |
17.26 |
| 2026-02-06 12:00 |
08:05:21.25 |
+20:00:25.9 |
HIP 39548 |
15.13 |
| 2026-02-07 00:00 |
08:05:07.59 |
+20:00:59.5 |
HIP 39548 |
13.46 |
| 2026-02-07 12:00 |
08:04:53.98 |
+20:01:32.9 |
HIP 39548 |
12.44 |
| 2026-02-08 00:00 |
08:04:40.42 |
+20:02:06.1 |
HIP 39548 |
12.23 |
| 2026-02-08 12:00 |
08:04:26.91 |
+20:02:39.1 |
HIP 39548 |
12.84 |
| 2026-02-09 00:00 |
08:04:13.46 |
+20:03:11.9 |
HIP 39548 |
14.18 |
| 2026-02-09 12:00 |
08:04:00.05 |
+20:03:44.5 |
HIP 39548 |
16.04 |
| 2026-02-10 00:00 |
08:03:46.70 |
+20:04:16.9 |
HIP 39428 |
16.30 |
| 2026-02-10 12:00 |
08:03:33.41 |
+20:04:49.0 |
HIP 39428 |
15.50 |
| 2026-02-11 00:00 |
08:03:20.17 |
+20:05:21.0 |
HIP 39428 |
15.32 |
| 2026-02-11 12:00 |
08:03:06.99 |
+20:05:52.7 |
HIP 39428 |
15.78 |
| 2026-02-12 00:00 |
08:02:53.87 |
+20:06:24.2 |
HIP 39428 |
16.81 |
| 2026-02-12 12:00 |
08:02:40.81 |
+20:06:55.5 |
HIP 39428 |
18.32 |
| 2026-02-13 00:00 |
08:02:27.81 |
+20:07:26.6 |
HIP 39428 |
20.19 |
| 2026-02-13 12:00 |
08:02:14.87 |
+20:07:57.5 |
HIP 39260 |
20.36 |
| 2026-02-14 00:00 |
08:02:01.99 |
+20:08:28.1 |
HIP 39260 |
18.94 |
| 2026-02-14 12:00 |
08:01:49.18 |
+20:08:58.5 |
HIP 39260 |
17.93 |
| 2026-02-15 00:00 |
08:01:36.43 |
+20:09:28.6 |
HIP 39260 |
17.41 |
| 2026-02-15 12:00 |
08:01:23.75 |
+20:09:58.6 |
HIP 39260 |
17.41 |
| 2026-02-16 00:00 |
08:01:11.14 |
+20:10:28.3 |
HIP 39260 |
17.92 |
| 2026-02-16 12:00 |
08:00:58.60 |
+20:10:57.7 |
HIP 39260 |
18.90 |
| 2026-02-17 00:00 |
08:00:46.12 |
+20:11:26.9 |
HIP 39260 |
20.26 |
| 2026-02-17 12:00 |
08:00:33.71 |
+20:11:55.9 |
HIP 39260 |
21.93 |
| 2026-02-18 00:00 |
08:00:21.38 |
+20:12:24.6 |
HIP 39260 |
23.84 |
| 2026-02-18 12:00 |
08:00:09.12 |
+20:12:53.1 |
HIP 39180 |
25.60 |
| 2026-02-19 00:00 |
07:59:56.93 |
+20:13:21.3 |
HIP 39180 |
27.18 |
| 2026-02-19 12:00 |
07:59:44.81 |
+20:13:49.3 |
HIP 39180 |
28.95 |
| 2026-02-20 00:00 |
07:59:32.77 |
+20:14:17.0 |
HIP 39180 |
30.88 |
| 2026-02-20 12:00 |
07:59:20.81 |
+20:14:44.5 |
HIP 39180 |
32.93 |
| 2026-02-21 00:00 |
07:59:08.92 |
+20:15:11.7 |
HIP 39180 |
35.07 |
| 2026-02-21 12:00 |
07:58:57.11 |
+20:15:38.7 |
HIP 39064 |
36.11 |
| 2026-02-22 00:00 |
07:58:45.38 |
+20:16:05.4 |
HIP 39064 |
36.43 |
| 2026-02-22 12:00 |
07:58:33.73 |
+20:16:31.9 |
HIP 38814 |
35.71 |
| 2026-02-23 00:00 |
07:58:22.16 |
+20:16:58.0 |
HIP 38814 |
33.96 |
| 2026-02-23 12:00 |
07:58:10.67 |
+20:17:24.0 |
HIP 38814 |
32.35 |
| 2026-02-24 00:00 |
07:57:59.26 |
+20:17:49.6 |
HIP 38814 |
30.92 |