P/2009 Q5 (McNaught)
| Parameter |
Value |
| Designation |
P/2009 Q5 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-09-08T13:50:29.091840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:34Z |
| Obs used |
331 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-10-09.0000000 |
| e |
0.60905285 |
| q (au) |
2.918512 |
| a (au) |
7.465233 |
| i (deg) |
40.904822 |
| Ω (om, deg) |
160.139864 |
| ω (w, deg) |
209.274918 |
| M (ma, deg) |
1.470093 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.633 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.633 |
| n |
2.000 |
| gf |
0.978 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.962 |
| 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 |
16:07:56.86 |
+17:53:56.0 |
HIP 79130 |
35.93 |
| 2026-02-03 12:00 |
16:08:05.93 |
+17:55:44.0 |
HIP 79130 |
36.64 |
| 2026-02-04 00:00 |
16:08:14.90 |
+17:57:32.8 |
HIP 79184 |
35.18 |
| 2026-02-04 12:00 |
16:08:23.77 |
+17:59:22.4 |
HIP 79184 |
32.48 |
| 2026-02-05 00:00 |
16:08:32.55 |
+18:01:12.7 |
HIP 79184 |
29.79 |
| 2026-02-05 12:00 |
16:08:41.22 |
+18:03:03.9 |
HIP 79184 |
27.13 |
| 2026-02-06 00:00 |
16:08:49.79 |
+18:04:56.0 |
HIP 79184 |
24.49 |
| 2026-02-06 12:00 |
16:08:58.26 |
+18:06:48.8 |
HIP 79184 |
21.88 |
| 2026-02-07 00:00 |
16:09:06.63 |
+18:08:42.3 |
HIP 79184 |
19.31 |
| 2026-02-07 12:00 |
16:09:14.90 |
+18:10:36.7 |
HIP 79184 |
16.79 |
| 2026-02-08 00:00 |
16:09:23.06 |
+18:12:31.9 |
HIP 79184 |
14.35 |
| 2026-02-08 12:00 |
16:09:31.12 |
+18:14:27.8 |
HIP 79184 |
12.02 |
| 2026-02-09 00:00 |
16:09:39.07 |
+18:16:24.5 |
HIP 79184 |
9.88 |
| 2026-02-09 12:00 |
16:09:46.92 |
+18:18:21.9 |
HIP 79184 |
8.07 |
| 2026-02-10 00:00 |
16:09:54.66 |
+18:20:20.2 |
HIP 79184 |
6.85 |
| 2026-02-10 12:00 |
16:10:02.30 |
+18:22:19.1 |
HIP 79184 |
6.54 |
| 2026-02-11 00:00 |
16:10:09.83 |
+18:24:18.8 |
HIP 79184 |
7.27 |
| 2026-02-11 12:00 |
16:10:17.25 |
+18:26:19.3 |
HIP 79184 |
8.75 |
| 2026-02-12 00:00 |
16:10:24.56 |
+18:28:20.4 |
HIP 79184 |
10.69 |
| 2026-02-12 12:00 |
16:10:31.76 |
+18:30:22.3 |
HIP 79184 |
12.86 |
| 2026-02-13 00:00 |
16:10:38.86 |
+18:32:25.0 |
HIP 79184 |
15.17 |
| 2026-02-13 12:00 |
16:10:45.84 |
+18:34:28.3 |
HIP 79184 |
17.55 |
| 2026-02-14 00:00 |
16:10:52.71 |
+18:36:32.3 |
HIP 79184 |
19.99 |
| 2026-02-14 12:00 |
16:10:59.47 |
+18:38:37.0 |
HIP 79184 |
22.45 |
| 2026-02-15 00:00 |
16:11:06.12 |
+18:40:42.4 |
HIP 79184 |
24.93 |
| 2026-02-15 12:00 |
16:11:12.65 |
+18:42:48.5 |
HIP 79184 |
27.42 |
| 2026-02-16 00:00 |
16:11:19.07 |
+18:44:55.3 |
HIP 79184 |
29.91 |
| 2026-02-16 12:00 |
16:11:25.38 |
+18:47:02.7 |
HIP 79453 |
27.88 |
| 2026-02-17 00:00 |
16:11:31.57 |
+18:49:10.8 |
HIP 79453 |
25.36 |
| 2026-02-17 12:00 |
16:11:37.65 |
+18:51:19.5 |
HIP 79453 |
22.86 |
| 2026-02-18 00:00 |
16:11:43.61 |
+18:53:28.8 |
HIP 79453 |
20.41 |
| 2026-02-18 12:00 |
16:11:49.45 |
+18:55:38.8 |
HIP 79453 |
18.00 |
| 2026-02-19 00:00 |
16:11:55.18 |
+18:57:49.4 |
HIP 79453 |
15.66 |
| 2026-02-19 12:00 |
16:12:00.79 |
+19:00:00.6 |
HIP 79453 |
13.43 |
| 2026-02-20 00:00 |
16:12:06.28 |
+19:02:12.4 |
HIP 79453 |
11.36 |
| 2026-02-20 12:00 |
16:12:11.66 |
+19:04:24.8 |
HIP 79453 |
9.55 |
| 2026-02-21 00:00 |
16:12:16.91 |
+19:06:37.8 |
HIP 79453 |
8.18 |
| 2026-02-21 12:00 |
16:12:22.05 |
+19:08:51.4 |
HIP 79453 |
7.48 |
| 2026-02-22 00:00 |
16:12:27.07 |
+19:11:05.5 |
HIP 79453 |
7.63 |
| 2026-02-22 12:00 |
16:12:31.97 |
+19:13:20.2 |
HIP 79393 |
7.70 |
| 2026-02-23 00:00 |
16:12:36.75 |
+19:15:35.4 |
HIP 79393 |
7.16 |
| 2026-02-23 12:00 |
16:12:41.40 |
+19:17:51.1 |
HIP 79393 |
7.45 |
| 2026-02-24 00:00 |
16:12:45.94 |
+19:20:07.4 |
HIP 79393 |
8.48 |