| Parameter |
Value |
| Designation |
353P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-12-22T00:55:05.024640Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:56Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
12.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-12-12.0000000 |
| e |
0.46877362 |
| q (au) |
2.212902 |
| a (au) |
4.165647 |
| i (deg) |
28.415165 |
| Ω (om, deg) |
121.588906 |
| ω (w, deg) |
230.495742 |
| M (ma, deg) |
189.468601 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.869 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.869 |
| n |
2.000 |
| gf |
0.953 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.775 |
| 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) |
| 2026-06-01 00:00 |
00:39:03.45 |
-13:32:30.7 |
HIP 3151 |
25.28 |
| 2026-06-01 12:00 |
00:40:05.44 |
-13:32:05.2 |
HIP 3151 |
21.00 |
| 2026-06-02 00:00 |
00:41:07.39 |
-13:31:41.2 |
HIP 3249 |
21.74 |
| 2026-06-02 12:00 |
00:42:09.30 |
-13:31:18.8 |
HIP 3249 |
23.67 |
| 2026-06-03 00:00 |
00:43:11.16 |
-13:30:58.1 |
HIP 3483 |
19.55 |
| 2026-06-03 12:00 |
00:44:12.97 |
-13:30:39.0 |
HIP 3483 |
6.73 |
| 2026-06-04 00:00 |
00:45:14.73 |
-13:30:21.5 |
HIP 3483 |
12.67 |
| 2026-06-04 12:00 |
00:46:16.45 |
-13:30:05.8 |
HIP 3648 |
16.80 |
| 2026-06-05 00:00 |
00:47:18.12 |
-13:29:51.7 |
HIP 3648 |
18.03 |
| 2026-06-05 12:00 |
00:48:19.74 |
-13:29:39.3 |
HIP 3849 |
16.49 |
| 2026-06-06 00:00 |
00:49:21.30 |
-13:29:28.7 |
HIP 3849 |
4.31 |
| 2026-06-06 12:00 |
00:50:22.82 |
-13:29:19.7 |
HIP 3849 |
14.58 |
| 2026-06-07 00:00 |
00:51:24.28 |
-13:29:12.6 |
HIP 4066 |
18.67 |
| 2026-06-07 12:00 |
00:52:25.69 |
-13:29:07.1 |
HIP 4066 |
15.91 |
| 2026-06-08 00:00 |
00:53:27.04 |
-13:29:03.5 |
HIP 4066 |
24.58 |
| 2026-06-08 12:00 |
00:54:28.33 |
-13:29:01.7 |
HIP 4209 |
28.49 |
| 2026-06-09 00:00 |
00:55:29.57 |
-13:29:01.7 |
HIP 4209 |
36.96 |
| 2026-06-09 12:00 |
00:56:30.74 |
-13:29:03.5 |
HIP 4594 |
35.23 |
| 2026-06-10 00:00 |
00:57:31.86 |
-13:29:07.2 |
HIP 4594 |
21.51 |
| 2026-06-10 12:00 |
00:58:32.91 |
-13:29:12.7 |
HIP 4594 |
11.15 |
| 2026-06-11 00:00 |
00:59:33.90 |
-13:29:20.1 |
HIP 4699 |
13.56 |
| 2026-06-11 12:00 |
01:00:34.83 |
-13:29:29.4 |
HIP 4699 |
7.11 |
| 2026-06-12 00:00 |
01:01:35.69 |
-13:29:40.6 |
HIP 4699 |
18.84 |
| 2026-06-12 12:00 |
01:02:36.48 |
-13:29:53.8 |
HIP 4699 |
33.10 |
| 2026-06-13 00:00 |
01:03:37.20 |
-13:30:08.8 |
HIP 5080 |
26.10 |
| 2026-06-13 12:00 |
01:04:37.85 |
-13:30:25.9 |
HIP 5080 |
16.41 |
| 2026-06-14 00:00 |
01:05:38.43 |
-13:30:44.9 |
HIP 5080 |
17.03 |
| 2026-06-14 12:00 |
01:06:38.94 |
-13:31:05.9 |
HIP 5080 |
27.25 |
| 2026-06-15 00:00 |
01:07:39.37 |
-13:31:28.8 |
HIP 5331 |
17.93 |
| 2026-06-15 12:00 |
01:08:39.72 |
-13:31:53.8 |
HIP 5331 |
18.00 |
| 2026-06-16 00:00 |
01:09:40.00 |
-13:32:20.9 |
HIP 5559 |
23.75 |
| 2026-06-16 12:00 |
01:10:40.20 |
-13:32:49.9 |
HIP 5559 |
9.39 |
| 2026-06-17 00:00 |
01:11:40.31 |
-13:33:21.0 |
HIP 5559 |
6.42 |
| 2026-06-17 12:00 |
01:12:40.35 |
-13:33:54.1 |
HIP 5616 |
9.31 |
| 2026-06-18 00:00 |
01:13:40.30 |
-13:34:29.3 |
HIP 5764 |
7.83 |
| 2026-06-18 12:00 |
01:14:40.16 |
-13:35:06.6 |
HIP 5835 |
10.04 |
| 2026-06-19 00:00 |
01:15:39.94 |
-13:35:46.0 |
HIP 5835 |
15.20 |
| 2026-06-19 12:00 |
01:16:39.63 |
-13:36:27.4 |
HIP 6008 |
22.42 |
| 2026-06-20 00:00 |
01:17:39.24 |
-13:37:11.0 |
HIP 6135 |
20.41 |
| 2026-06-20 12:00 |
01:18:38.75 |
-13:37:56.7 |
HIP 6135 |
14.16 |
| 2026-06-21 00:00 |
01:19:38.17 |
-13:38:44.4 |
HIP 6135 |
20.12 |
| 2026-06-21 12:00 |
01:20:37.50 |
-13:39:34.4 |
HIP 6288 |
13.85 |
| 2026-06-22 00:00 |
01:21:36.74 |
-13:40:26.4 |
HIP 6288 |
18.80 |