| Parameter |
Value |
| Designation |
350P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-03-17T14:21:14.492160Z |
| Orbit solution date (soln_date, UTC) |
2026-05-11T09:02:25Z |
| Obs used |
84 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
18.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-06-27.0000000 |
| e |
0.09276561 |
| q (au) |
3.707329 |
| a (au) |
4.086407 |
| i (deg) |
7.362090 |
| Ω (om, deg) |
65.297685 |
| ω (w, deg) |
139.657805 |
| M (ma, deg) |
197.780822 |
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) |
| 2026-05-12 00:00 |
13:49:05.58 |
-05:39:37.0 |
HIP 67370 |
16.06 |
| 2026-05-12 12:00 |
13:48:49.19 |
-05:39:05.6 |
HIP 67323 |
13.51 |
| 2026-05-13 00:00 |
13:48:32.95 |
-05:38:35.4 |
HIP 67323 |
9.48 |
| 2026-05-13 12:00 |
13:48:16.88 |
-05:38:06.4 |
HIP 67323 |
5.55 |
| 2026-05-14 00:00 |
13:48:00.98 |
-05:37:38.7 |
HIP 67323 |
2.10 |
| 2026-05-14 12:00 |
13:47:45.25 |
-05:37:12.2 |
HIP 67323 |
3.09 |
| 2026-05-15 00:00 |
13:47:29.68 |
-05:36:47.0 |
HIP 67323 |
6.72 |
| 2026-05-15 12:00 |
13:47:14.29 |
-05:36:23.1 |
HIP 67323 |
10.50 |
| 2026-05-16 00:00 |
13:46:59.09 |
-05:36:00.4 |
HIP 67323 |
14.27 |
| 2026-05-16 12:00 |
13:46:44.06 |
-05:35:39.1 |
HIP 67323 |
18.01 |
| 2026-05-17 00:00 |
13:46:29.22 |
-05:35:19.1 |
HIP 67323 |
21.71 |
| 2026-05-17 12:00 |
13:46:14.56 |
-05:35:00.4 |
HIP 67323 |
25.37 |
| 2026-05-18 00:00 |
13:46:00.10 |
-05:34:43.0 |
HIP 67323 |
28.97 |
| 2026-05-18 12:00 |
13:45:45.83 |
-05:34:27.0 |
HIP 67004 |
28.12 |
| 2026-05-19 00:00 |
13:45:31.75 |
-05:34:12.3 |
HIP 67004 |
24.63 |
| 2026-05-19 12:00 |
13:45:17.88 |
-05:33:59.0 |
HIP 67004 |
21.19 |
| 2026-05-20 00:00 |
13:45:04.20 |
-05:33:47.0 |
HIP 67004 |
17.82 |
| 2026-05-20 12:00 |
13:44:50.73 |
-05:33:36.5 |
HIP 67004 |
14.52 |
| 2026-05-21 00:00 |
13:44:37.47 |
-05:33:27.3 |
HIP 67004 |
11.31 |
| 2026-05-21 12:00 |
13:44:24.41 |
-05:33:19.5 |
HIP 67004 |
8.23 |
| 2026-05-22 00:00 |
13:44:11.56 |
-05:33:13.1 |
HIP 67004 |
5.41 |
| 2026-05-22 12:00 |
13:43:58.93 |
-05:33:08.1 |
HIP 67004 |
3.40 |
| 2026-05-23 00:00 |
13:43:46.51 |
-05:33:04.4 |
HIP 67004 |
3.69 |
| 2026-05-23 12:00 |
13:43:34.31 |
-05:33:02.2 |
HIP 67004 |
5.86 |
| 2026-05-24 00:00 |
13:43:22.32 |
-05:33:01.4 |
HIP 67004 |
8.53 |
| 2026-05-24 12:00 |
13:43:10.56 |
-05:33:02.1 |
HIP 67004 |
11.31 |
| 2026-05-25 00:00 |
13:42:59.01 |
-05:33:04.1 |
HIP 67004 |
14.10 |
| 2026-05-25 12:00 |
13:42:47.69 |
-05:33:07.5 |
HIP 67004 |
16.87 |
| 2026-05-26 00:00 |
13:42:36.59 |
-05:33:12.4 |
HIP 67004 |
19.60 |
| 2026-05-26 12:00 |
13:42:25.73 |
-05:33:18.7 |
HIP 67004 |
22.29 |
| 2026-05-27 00:00 |
13:42:15.08 |
-05:33:26.4 |
HIP 67004 |
24.93 |
| 2026-05-27 12:00 |
13:42:04.67 |
-05:33:35.6 |
HIP 67004 |
27.52 |
| 2026-05-28 00:00 |
13:41:54.49 |
-05:33:46.1 |
HIP 66706 |
29.26 |
| 2026-05-28 12:00 |
13:41:44.53 |
-05:33:58.1 |
HIP 66706 |
27.57 |
| 2026-05-29 00:00 |
13:41:34.82 |
-05:34:11.6 |
HIP 66706 |
26.06 |
| 2026-05-29 12:00 |
13:41:25.33 |
-05:34:26.4 |
HIP 66706 |
24.75 |
| 2026-05-30 00:00 |
13:41:16.08 |
-05:34:42.7 |
HIP 66706 |
23.66 |
| 2026-05-30 12:00 |
13:41:07.07 |
-05:35:00.4 |
HIP 66706 |
22.80 |
| 2026-05-31 00:00 |
13:40:58.29 |
-05:35:19.6 |
HIP 66706 |
22.19 |
| 2026-05-31 12:00 |
13:40:49.75 |
-05:35:40.2 |
HIP 66706 |
21.82 |
| 2026-06-01 00:00 |
13:40:41.45 |
-05:36:02.2 |
HIP 66706 |
21.70 |
| 2026-06-01 12:00 |
13:40:33.39 |
-05:36:25.7 |
HIP 66706 |
21.80 |
| 2026-06-02 00:00 |
13:40:25.57 |
-05:36:50.5 |
HIP 66706 |
22.12 |