350P/McNaught
| Parameter |
Value |
| Designation |
350P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-12-20T10:42:44.631360Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T15:17:51Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-05-11.0000000 |
| e |
0.09057968 |
| q (au) |
3.728020 |
| a (au) |
4.099337 |
| i (deg) |
7.356615 |
| Ω (om, deg) |
65.408974 |
| ω (w, deg) |
141.035724 |
| M (ma, deg) |
103.615755 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.379 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.379 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.721 |
| k |
0.800 |
| 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 |
14:17:46.06 |
-07:41:48.6 |
HIP 69881 |
9.97 |
| 2026-02-03 12:00 |
14:17:58.68 |
-07:42:33.5 |
HIP 69881 |
10.06 |
| 2026-02-04 00:00 |
14:18:11.07 |
-07:43:17.2 |
HIP 69881 |
11.09 |
| 2026-02-04 12:00 |
14:18:23.22 |
-07:43:59.6 |
HIP 69881 |
12.78 |
| 2026-02-05 00:00 |
14:18:35.15 |
-07:44:40.8 |
HIP 69993 |
12.59 |
| 2026-02-05 12:00 |
14:18:46.84 |
-07:45:20.8 |
HIP 69993 |
9.78 |
| 2026-02-06 00:00 |
14:18:58.30 |
-07:45:59.5 |
HIP 69993 |
7.17 |
| 2026-02-06 12:00 |
14:19:09.52 |
-07:46:37.0 |
HIP 69993 |
4.94 |
| 2026-02-07 00:00 |
14:19:20.51 |
-07:47:13.3 |
HIP 69993 |
3.70 |
| 2026-02-07 12:00 |
14:19:31.25 |
-07:47:48.4 |
HIP 69993 |
4.29 |
| 2026-02-08 00:00 |
14:19:41.76 |
-07:48:22.2 |
HIP 69993 |
6.11 |
| 2026-02-08 12:00 |
14:19:52.02 |
-07:48:54.7 |
HIP 69993 |
8.34 |
| 2026-02-09 00:00 |
14:20:02.05 |
-07:49:26.0 |
HIP 69993 |
10.68 |
| 2026-02-09 12:00 |
14:20:11.83 |
-07:49:56.1 |
HIP 69993 |
13.04 |
| 2026-02-10 00:00 |
14:20:21.36 |
-07:50:25.0 |
HIP 69993 |
15.37 |
| 2026-02-10 12:00 |
14:20:30.65 |
-07:50:52.6 |
HIP 70046 |
15.99 |
| 2026-02-11 00:00 |
14:20:39.69 |
-07:51:18.9 |
HIP 70046 |
16.74 |
| 2026-02-11 12:00 |
14:20:48.48 |
-07:51:44.0 |
HIP 70046 |
17.74 |
| 2026-02-12 00:00 |
14:20:57.02 |
-07:52:07.9 |
HIP 70046 |
18.91 |
| 2026-02-12 12:00 |
14:21:05.31 |
-07:52:30.5 |
HIP 70226 |
19.16 |
| 2026-02-13 00:00 |
14:21:13.34 |
-07:52:51.9 |
HIP 70226 |
17.49 |
| 2026-02-13 12:00 |
14:21:21.13 |
-07:53:12.0 |
HIP 70226 |
15.96 |
| 2026-02-14 00:00 |
14:21:28.65 |
-07:53:30.9 |
HIP 70226 |
14.58 |
| 2026-02-14 12:00 |
14:21:35.93 |
-07:53:48.6 |
HIP 70226 |
13.37 |
| 2026-02-15 00:00 |
14:21:42.94 |
-07:54:05.0 |
HIP 70226 |
12.36 |
| 2026-02-15 12:00 |
14:21:49.70 |
-07:54:20.1 |
HIP 70226 |
11.57 |
| 2026-02-16 00:00 |
14:21:56.19 |
-07:54:34.1 |
HIP 70226 |
11.01 |
| 2026-02-16 12:00 |
14:22:02.43 |
-07:54:46.8 |
HIP 70226 |
10.70 |
| 2026-02-17 00:00 |
14:22:08.41 |
-07:54:58.2 |
HIP 70226 |
10.61 |
| 2026-02-17 12:00 |
14:22:14.12 |
-07:55:08.5 |
HIP 70226 |
10.74 |
| 2026-02-18 00:00 |
14:22:19.57 |
-07:55:17.5 |
HIP 70269 |
10.36 |
| 2026-02-18 12:00 |
14:22:24.76 |
-07:55:25.2 |
HIP 70269 |
9.96 |
| 2026-02-19 00:00 |
14:22:29.69 |
-07:55:31.8 |
HIP 70269 |
9.72 |
| 2026-02-19 12:00 |
14:22:34.34 |
-07:55:37.1 |
HIP 70269 |
9.61 |
| 2026-02-20 00:00 |
14:22:38.74 |
-07:55:41.2 |
HIP 70269 |
9.62 |
| 2026-02-20 12:00 |
14:22:42.87 |
-07:55:44.1 |
HIP 70269 |
9.72 |
| 2026-02-21 00:00 |
14:22:46.73 |
-07:55:45.8 |
HIP 70269 |
9.90 |
| 2026-02-21 12:00 |
14:22:50.32 |
-07:55:46.3 |
HIP 70269 |
10.12 |
| 2026-02-22 00:00 |
14:22:53.64 |
-07:55:45.6 |
HIP 70269 |
10.38 |
| 2026-02-22 12:00 |
14:22:56.70 |
-07:55:43.7 |
HIP 70269 |
10.64 |
| 2026-02-23 00:00 |
14:22:59.49 |
-07:55:40.6 |
HIP 70269 |
10.90 |
| 2026-02-23 12:00 |
14:23:02.01 |
-07:55:36.3 |
HIP 70269 |
11.15 |
| 2026-02-24 00:00 |
14:23:04.26 |
-07:55:30.8 |
HIP 70269 |
11.37 |