| Parameter |
Value |
| Designation |
350P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-03-15T22:55:35.915520Z |
| Orbit solution date (soln_date, UTC) |
2026-09-16T06:41:51Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
18.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-01-23.0000000 |
| e |
0.09341157 |
| q (au) |
3.702883 |
| a (au) |
4.084415 |
| i (deg) |
7.364151 |
| Ω (om, deg) |
65.293124 |
| ω (w, deg) |
139.619508 |
| M (ma, deg) |
222.932570 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.506 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.506 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.762 |
| 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) |
| 2026-09-20 00:00 |
14:37:53.30 |
-13:55:39.0 |
HIP 71420 |
23.58 |
| 2026-09-20 12:00 |
14:38:25.73 |
-13:58:45.9 |
HIP 71684 |
18.42 |
| 2026-09-21 00:00 |
14:38:58.25 |
-14:01:52.8 |
HIP 71684 |
10.95 |
| 2026-09-21 12:00 |
14:39:30.86 |
-14:04:59.6 |
HIP 71684 |
6.66 |
| 2026-09-22 00:00 |
14:40:03.57 |
-14:08:06.4 |
HIP 71745 |
8.73 |
| 2026-09-22 12:00 |
14:40:36.36 |
-14:11:13.1 |
HIP 71745 |
8.48 |
| 2026-09-23 00:00 |
14:41:09.25 |
-14:14:19.7 |
HIP 71745 |
14.62 |
| 2026-09-23 12:00 |
14:41:42.23 |
-14:17:26.3 |
HIP 71745 |
22.42 |
| 2026-09-24 00:00 |
14:42:15.29 |
-14:20:32.7 |
HIP 71807 |
28.34 |
| 2026-09-24 12:00 |
14:42:48.44 |
-14:23:39.1 |
HIP 72090 |
29.87 |
| 2026-09-25 00:00 |
14:43:21.68 |
-14:26:45.4 |
HIP 72090 |
22.35 |
| 2026-09-25 12:00 |
14:43:55.01 |
-14:29:51.6 |
HIP 72090 |
15.99 |
| 2026-09-26 00:00 |
14:44:28.42 |
-14:32:57.7 |
HIP 72090 |
12.68 |
| 2026-09-26 12:00 |
14:45:01.92 |
-14:36:03.6 |
HIP 72090 |
14.70 |
| 2026-09-27 00:00 |
14:45:35.51 |
-14:39:09.5 |
HIP 72090 |
20.56 |
| 2026-09-27 12:00 |
14:46:09.18 |
-14:42:15.3 |
HIP 72182 |
17.76 |
| 2026-09-28 00:00 |
14:46:42.93 |
-14:45:20.9 |
HIP 72182 |
18.85 |
| 2026-09-28 12:00 |
14:47:16.77 |
-14:48:26.4 |
HIP 72182 |
23.42 |
| 2026-09-29 00:00 |
14:47:50.70 |
-14:51:31.7 |
HIP 72417 |
23.61 |
| 2026-09-29 12:00 |
14:48:24.70 |
-14:54:37.0 |
HIP 72417 |
18.99 |
| 2026-09-30 00:00 |
14:48:58.79 |
-14:57:42.0 |
HIP 72417 |
17.83 |
| 2026-09-30 12:00 |
14:49:32.96 |
-15:00:47.0 |
HIP 72417 |
20.75 |
| 2026-10-01 00:00 |
14:50:07.22 |
-15:03:51.8 |
HIP 72640 |
13.81 |
| 2026-10-01 12:00 |
14:50:41.55 |
-15:06:56.4 |
HIP 72640 |
7.52 |
| 2026-10-02 00:00 |
14:51:15.97 |
-15:10:00.9 |
HIP 72676 |
6.73 |
| 2026-10-02 12:00 |
14:51:50.47 |
-15:13:05.2 |
HIP 72676 |
9.08 |
| 2026-10-03 00:00 |
14:52:25.04 |
-15:16:09.3 |
HIP 72769 |
7.29 |
| 2026-10-03 12:00 |
14:52:59.70 |
-15:19:13.3 |
HIP 72769 |
7.85 |
| 2026-10-04 00:00 |
14:53:34.44 |
-15:22:17.1 |
HIP 72769 |
15.13 |
| 2026-10-04 12:00 |
14:54:09.25 |
-15:25:20.7 |
HIP 73032 |
20.75 |
| 2026-10-05 00:00 |
14:54:44.15 |
-15:28:24.1 |
HIP 73032 |
14.20 |
| 2026-10-05 12:00 |
14:55:19.12 |
-15:31:27.4 |
HIP 73032 |
11.53 |
| 2026-10-06 00:00 |
14:55:54.17 |
-15:34:30.4 |
HIP 73074 |
5.29 |
| 2026-10-06 12:00 |
14:56:29.29 |
-15:37:33.2 |
HIP 73074 |
6.70 |
| 2026-10-07 00:00 |
14:57:04.50 |
-15:40:35.8 |
HIP 73074 |
14.96 |
| 2026-10-07 12:00 |
14:57:39.77 |
-15:43:38.2 |
HIP 73074 |
23.78 |
| 2026-10-08 00:00 |
14:58:15.13 |
-15:46:40.4 |
HIP 73308 |
22.41 |
| 2026-10-08 12:00 |
14:58:50.55 |
-15:49:42.3 |
HIP 73308 |
23.53 |
| 2026-10-09 00:00 |
14:59:26.05 |
-15:52:44.0 |
HIP 73308 |
27.74 |
| 2026-10-09 12:00 |
15:00:01.63 |
-15:55:45.5 |
HIP 73517 |
22.22 |
| 2026-10-10 00:00 |
15:00:37.27 |
-15:58:46.7 |
HIP 73517 |
13.92 |
| 2026-10-10 12:00 |
15:01:12.99 |
-16:01:47.7 |
HIP 73517 |
7.66 |
| 2026-10-11 00:00 |
15:01:48.78 |
-16:04:48.5 |
HIP 73517 |
9.45 |