| 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 |
-0.509 |
| 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) |
| 2026-06-01 00:00 |
17:39:38.04 |
-34:18:29.0 |
HIP 86572 |
27.22 |
| 2026-06-01 12:00 |
17:39:18.46 |
-34:18:27.2 |
HIP 86256 |
29.86 |
| 2026-06-02 00:00 |
17:38:58.77 |
-34:18:24.4 |
HIP 86256 |
27.06 |
| 2026-06-02 12:00 |
17:38:38.97 |
-34:18:20.6 |
HIP 86256 |
24.62 |
| 2026-06-03 00:00 |
17:38:19.05 |
-34:18:15.8 |
HIP 86256 |
22.66 |
| 2026-06-03 12:00 |
17:37:59.04 |
-34:18:09.9 |
HIP 86197 |
20.61 |
| 2026-06-04 00:00 |
17:37:38.92 |
-34:18:03.0 |
HIP 86197 |
18.06 |
| 2026-06-04 12:00 |
17:37:18.71 |
-34:17:55.1 |
HIP 86197 |
16.16 |
| 2026-06-05 00:00 |
17:36:58.40 |
-34:17:46.1 |
HIP 86197 |
15.19 |
| 2026-06-05 12:00 |
17:36:38.01 |
-34:17:36.1 |
HIP 86197 |
15.33 |
| 2026-06-06 00:00 |
17:36:17.53 |
-34:17:25.0 |
HIP 86197 |
16.58 |
| 2026-06-06 12:00 |
17:35:56.97 |
-34:17:12.9 |
HIP 86197 |
18.72 |
| 2026-06-07 00:00 |
17:35:36.33 |
-34:16:59.7 |
HIP 86197 |
21.51 |
| 2026-06-07 12:00 |
17:35:15.62 |
-34:16:45.4 |
HIP 86197 |
24.72 |
| 2026-06-08 00:00 |
17:34:54.84 |
-34:16:30.1 |
HIP 86197 |
28.23 |
| 2026-06-08 12:00 |
17:34:33.99 |
-34:16:13.7 |
HIP 85839 |
26.73 |
| 2026-06-09 00:00 |
17:34:13.09 |
-34:15:56.3 |
HIP 85839 |
22.42 |
| 2026-06-09 12:00 |
17:33:52.13 |
-34:15:37.8 |
HIP 85839 |
18.11 |
| 2026-06-10 00:00 |
17:33:31.11 |
-34:15:18.2 |
HIP 85839 |
13.81 |
| 2026-06-10 12:00 |
17:33:10.05 |
-34:14:57.6 |
HIP 85839 |
9.56 |
| 2026-06-11 00:00 |
17:32:48.95 |
-34:14:35.9 |
HIP 85839 |
5.47 |
| 2026-06-11 12:00 |
17:32:27.81 |
-34:14:13.1 |
HIP 85839 |
2.62 |
| 2026-06-12 00:00 |
17:32:06.63 |
-34:13:49.2 |
HIP 85839 |
4.74 |
| 2026-06-12 12:00 |
17:31:45.43 |
-34:13:24.3 |
HIP 85839 |
8.77 |
| 2026-06-13 00:00 |
17:31:24.20 |
-34:12:58.3 |
HIP 85839 |
13.05 |
| 2026-06-13 12:00 |
17:31:02.94 |
-34:12:31.3 |
HIP 85839 |
17.41 |
| 2026-06-14 00:00 |
17:30:41.68 |
-34:12:03.1 |
HIP 85660 |
17.37 |
| 2026-06-14 12:00 |
17:30:20.40 |
-34:11:34.0 |
HIP 85660 |
17.26 |
| 2026-06-15 00:00 |
17:29:59.11 |
-34:11:03.7 |
HIP 85660 |
18.28 |
| 2026-06-15 12:00 |
17:29:37.83 |
-34:10:32.4 |
HIP 85660 |
20.24 |
| 2026-06-16 00:00 |
17:29:16.55 |
-34:10:00.1 |
HIP 85660 |
22.92 |
| 2026-06-16 12:00 |
17:28:55.27 |
-34:09:26.7 |
HIP 85588 |
24.64 |
| 2026-06-17 00:00 |
17:28:34.01 |
-34:08:52.2 |
HIP 85372 |
23.59 |
| 2026-06-17 12:00 |
17:28:12.76 |
-34:08:16.8 |
HIP 85372 |
19.15 |
| 2026-06-18 00:00 |
17:27:51.54 |
-34:07:40.3 |
HIP 85372 |
14.72 |
| 2026-06-18 12:00 |
17:27:30.34 |
-34:07:02.7 |
HIP 85372 |
10.29 |
| 2026-06-19 00:00 |
17:27:09.17 |
-34:06:24.2 |
HIP 85372 |
5.86 |
| 2026-06-19 12:00 |
17:26:48.04 |
-34:05:44.6 |
HIP 85372 |
1.43 |
| 2026-06-20 00:00 |
17:26:26.95 |
-34:05:04.0 |
HIP 85372 |
2.99 |
| 2026-06-20 12:00 |
17:26:05.90 |
-34:04:22.4 |
HIP 85372 |
7.40 |
| 2026-06-21 00:00 |
17:25:44.91 |
-34:03:39.8 |
HIP 85372 |
11.80 |
| 2026-06-21 12:00 |
17:25:23.96 |
-34:02:56.3 |
HIP 85372 |
16.20 |
| 2026-06-22 00:00 |
17:25:03.07 |
-34:02:11.7 |
HIP 85372 |
20.59 |