372P/McNaught
| Parameter |
Value |
| Designation |
372P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-04-21T12:58:57.285120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:37Z |
| Obs used |
438 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
15.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-08-08T11:54:29.952000Z |
| Discovery magnitude (MPC) |
22.40 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-04-15.0000000 |
| e |
0.15350456 |
| q (au) |
3.803759 |
| a (au) |
4.493537 |
| i (deg) |
9.518532 |
| Ω (om, deg) |
325.860084 |
| ω (w, deg) |
27.455141 |
| M (ma, deg) |
359.323198 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.453 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.453 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.504 |
| 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) |
| 2026-02-03 00:00 |
17:14:05.27 |
-31:19:54.2 |
HIP 84318 |
7.78 |
| 2026-02-03 12:00 |
17:14:34.11 |
-31:20:53.8 |
HIP 84381 |
6.42 |
| 2026-02-04 00:00 |
17:15:02.86 |
-31:21:53.2 |
HIP 84381 |
2.24 |
| 2026-02-04 12:00 |
17:15:31.49 |
-31:22:52.5 |
HIP 84381 |
6.77 |
| 2026-02-05 00:00 |
17:16:00.02 |
-31:23:51.6 |
HIP 84381 |
12.76 |
| 2026-02-05 12:00 |
17:16:28.44 |
-31:24:50.4 |
HIP 84381 |
18.84 |
| 2026-02-06 00:00 |
17:16:56.75 |
-31:25:49.2 |
HIP 84381 |
24.92 |
| 2026-02-06 12:00 |
17:17:24.95 |
-31:26:47.7 |
HIP 84734 |
24.37 |
| 2026-02-07 00:00 |
17:17:53.03 |
-31:27:46.1 |
HIP 84734 |
18.84 |
| 2026-02-07 12:00 |
17:18:21.01 |
-31:28:44.4 |
HIP 84734 |
13.80 |
| 2026-02-08 00:00 |
17:18:48.86 |
-31:29:42.4 |
HIP 84734 |
9.96 |
| 2026-02-08 12:00 |
17:19:16.60 |
-31:30:40.4 |
HIP 84734 |
8.98 |
| 2026-02-09 00:00 |
17:19:44.23 |
-31:31:38.1 |
HIP 84778 |
9.81 |
| 2026-02-09 12:00 |
17:20:11.73 |
-31:32:35.7 |
HIP 84778 |
10.69 |
| 2026-02-10 00:00 |
17:20:39.11 |
-31:33:33.2 |
HIP 84778 |
14.22 |
| 2026-02-10 12:00 |
17:21:06.38 |
-31:34:30.5 |
HIP 84987 |
15.13 |
| 2026-02-11 00:00 |
17:21:33.52 |
-31:35:27.7 |
HIP 84987 |
9.41 |
| 2026-02-11 12:00 |
17:22:00.53 |
-31:36:24.7 |
HIP 84987 |
4.12 |
| 2026-02-12 00:00 |
17:22:27.43 |
-31:37:21.6 |
HIP 84987 |
3.64 |
| 2026-02-12 12:00 |
17:22:54.19 |
-31:38:18.3 |
HIP 84987 |
8.73 |
| 2026-02-13 00:00 |
17:23:20.83 |
-31:39:14.9 |
HIP 85100 |
3.74 |
| 2026-02-13 12:00 |
17:23:47.34 |
-31:40:11.4 |
HIP 85100 |
3.62 |
| 2026-02-14 00:00 |
17:24:13.72 |
-31:41:07.7 |
HIP 85100 |
8.78 |
| 2026-02-14 12:00 |
17:24:39.96 |
-31:42:04.0 |
HIP 85100 |
14.32 |
| 2026-02-15 00:00 |
17:25:06.08 |
-31:43:00.1 |
HIP 85329 |
15.50 |
| 2026-02-15 12:00 |
17:25:32.06 |
-31:43:56.0 |
HIP 85329 |
10.77 |
| 2026-02-16 00:00 |
17:25:57.90 |
-31:44:51.9 |
HIP 85329 |
7.41 |
| 2026-02-16 12:00 |
17:26:23.61 |
-31:45:47.6 |
HIP 85329 |
7.47 |
| 2026-02-17 00:00 |
17:26:49.18 |
-31:46:43.2 |
HIP 85329 |
10.85 |
| 2026-02-17 12:00 |
17:27:14.61 |
-31:47:38.7 |
HIP 85329 |
15.49 |
| 2026-02-18 00:00 |
17:27:39.90 |
-31:48:34.1 |
HIP 85329 |
20.52 |
| 2026-02-18 12:00 |
17:28:05.05 |
-31:49:29.4 |
HIP 85569 |
22.64 |
| 2026-02-19 00:00 |
17:28:30.05 |
-31:50:24.5 |
HIP 85569 |
20.49 |
| 2026-02-19 12:00 |
17:28:54.91 |
-31:51:19.6 |
HIP 85569 |
19.65 |
| 2026-02-20 00:00 |
17:29:19.62 |
-31:52:14.6 |
HIP 85569 |
20.24 |
| 2026-02-20 12:00 |
17:29:44.19 |
-31:53:09.4 |
HIP 85752 |
21.77 |
| 2026-02-21 00:00 |
17:30:08.61 |
-31:54:04.2 |
HIP 85752 |
16.52 |
| 2026-02-21 12:00 |
17:30:32.88 |
-31:54:58.9 |
HIP 85752 |
11.31 |
| 2026-02-22 00:00 |
17:30:56.99 |
-31:55:53.4 |
HIP 85752 |
6.17 |
| 2026-02-22 12:00 |
17:31:20.96 |
-31:56:47.9 |
HIP 85752 |
1.53 |
| 2026-02-23 00:00 |
17:31:44.77 |
-31:57:42.3 |
HIP 85752 |
4.43 |
| 2026-02-23 12:00 |
17:32:08.43 |
-31:58:36.7 |
HIP 85811 |
9.10 |
| 2026-02-24 00:00 |
17:32:31.94 |
-31:59:30.9 |
HIP 85811 |
11.81 |