353P/McNaught
| 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
$$
M_a = (16.866 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.866 |
| n |
2.000 |
| gf |
0.975 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.948 |
| 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 |
20:31:45.59 |
-19:11:10.4 |
HIP 101405 |
19.62 |
| 2026-02-03 12:00 |
20:32:46.54 |
-19:10:34.0 |
HIP 101405 |
8.67 |
| 2026-02-04 00:00 |
20:33:47.54 |
-19:09:56.4 |
HIP 101506 |
9.08 |
| 2026-02-04 12:00 |
20:34:48.58 |
-19:09:17.7 |
HIP 101506 |
12.07 |
| 2026-02-05 00:00 |
20:35:49.66 |
-19:08:37.9 |
HIP 101621 |
3.82 |
| 2026-02-05 12:00 |
20:36:50.78 |
-19:07:57.0 |
HIP 101651 |
13.56 |
| 2026-02-06 00:00 |
20:37:51.94 |
-19:07:14.9 |
HIP 101797 |
20.70 |
| 2026-02-06 12:00 |
20:38:53.15 |
-19:06:31.7 |
HIP 101922 |
11.48 |
| 2026-02-07 00:00 |
20:39:54.39 |
-19:05:47.5 |
HIP 101922 |
14.24 |
| 2026-02-07 12:00 |
20:40:55.67 |
-19:05:02.1 |
HIP 102046 |
17.61 |
| 2026-02-08 00:00 |
20:41:56.99 |
-19:04:15.7 |
HIP 102235 |
16.91 |
| 2026-02-08 12:00 |
20:42:58.36 |
-19:03:28.1 |
HIP 102235 |
8.50 |
| 2026-02-09 00:00 |
20:43:59.75 |
-19:02:39.5 |
HIP 102235 |
16.75 |
| 2026-02-09 12:00 |
20:45:01.19 |
-19:01:49.8 |
HIP 102509 |
24.45 |
| 2026-02-10 00:00 |
20:46:02.67 |
-19:00:59.0 |
HIP 102509 |
13.82 |
| 2026-02-10 12:00 |
20:47:04.18 |
-19:00:07.2 |
HIP 102509 |
14.42 |
| 2026-02-11 00:00 |
20:48:05.72 |
-18:59:14.3 |
HIP 102726 |
12.23 |
| 2026-02-11 12:00 |
20:49:07.31 |
-18:58:20.4 |
HIP 102726 |
3.74 |
| 2026-02-12 00:00 |
20:50:08.93 |
-18:57:25.5 |
HIP 102726 |
17.44 |
| 2026-02-12 12:00 |
20:51:10.58 |
-18:56:29.5 |
HIP 102726 |
31.96 |
| 2026-02-13 00:00 |
20:52:12.27 |
-18:55:32.5 |
HIP 103114 |
22.00 |
| 2026-02-13 12:00 |
20:53:13.99 |
-18:54:34.4 |
HIP 103138 |
11.07 |
| 2026-02-14 00:00 |
20:54:15.75 |
-18:53:35.4 |
HIP 103166 |
6.65 |
| 2026-02-14 12:00 |
20:55:17.53 |
-18:52:35.3 |
HIP 103224 |
8.82 |
| 2026-02-15 00:00 |
20:56:19.36 |
-18:51:34.3 |
HIP 103332 |
10.94 |
| 2026-02-15 12:00 |
20:57:21.21 |
-18:50:32.3 |
HIP 103332 |
21.33 |
| 2026-02-16 00:00 |
20:58:23.09 |
-18:49:29.3 |
HIP 103566 |
10.78 |
| 2026-02-16 12:00 |
20:59:25.01 |
-18:48:25.3 |
HIP 103566 |
8.45 |
| 2026-02-17 00:00 |
21:00:26.95 |
-18:47:20.4 |
HIP 103751 |
16.04 |
| 2026-02-17 12:00 |
21:01:28.93 |
-18:46:14.5 |
HIP 103751 |
8.83 |
| 2026-02-18 00:00 |
21:02:30.93 |
-18:45:07.7 |
HIP 103751 |
18.20 |
| 2026-02-18 12:00 |
21:03:32.96 |
-18:44:00.0 |
HIP 103997 |
15.85 |
| 2026-02-19 00:00 |
21:04:35.02 |
-18:42:51.2 |
HIP 103997 |
12.53 |
| 2026-02-19 12:00 |
21:05:37.11 |
-18:41:41.6 |
HIP 104230 |
21.19 |
| 2026-02-20 00:00 |
21:06:39.22 |
-18:40:31.1 |
HIP 104230 |
6.66 |
| 2026-02-20 12:00 |
21:07:41.37 |
-18:39:19.7 |
HIP 104230 |
8.69 |
| 2026-02-21 00:00 |
21:08:43.53 |
-18:38:07.4 |
HIP 104387 |
5.71 |
| 2026-02-21 12:00 |
21:09:45.72 |
-18:36:54.2 |
HIP 104387 |
14.83 |
| 2026-02-22 00:00 |
21:10:47.94 |
-18:35:40.2 |
HIP 104540 |
16.25 |
| 2026-02-22 12:00 |
21:11:50.18 |
-18:34:25.2 |
HIP 104540 |
23.51 |
| 2026-02-23 00:00 |
21:12:52.45 |
-18:33:09.5 |
HIP 104540 |
35.78 |
| 2026-02-23 12:00 |
21:13:54.74 |
-18:31:52.8 |
HIP 104915 |
31.09 |
| 2026-02-24 00:00 |
21:14:57.05 |
-18:30:35.4 |
HIP 104915 |
24.51 |