130P/McNaught-Hughes
| Parameter |
Value |
| Designation |
130P/McNaught-Hughes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-01-21T18:21:27.048960Z |
| Orbit solution date (soln_date, UTC) |
2025-12-29T09:23:47Z |
| Obs used |
2366 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-03-01.0000000 |
| e |
0.46080056 |
| q (au) |
1.823638 |
| a (au) |
3.382121 |
| i (deg) |
6.065359 |
| Ω (om, deg) |
70.255716 |
| ω (w, deg) |
245.911679 |
| M (ma, deg) |
6.058743 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.078 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.078 |
| n |
6.000 |
| gf |
0.879 |
| gb |
-0.719 |
| k |
0.974 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-03-07 |
2024-10-22 |
+6.1833 |
-2.363 |
| 2024-10-22 |
2025-02-17 |
+6.9213 |
-2.995 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:13:54.84 |
+27:17:35.4 |
HIP 29510 |
14.64 |
| 2026-02-03 12:00 |
06:13:40.71 |
+27:17:35.4 |
HIP 29510 |
12.19 |
| 2026-02-04 00:00 |
06:13:26.85 |
+27:17:35.1 |
HIP 29510 |
10.17 |
| 2026-02-04 12:00 |
06:13:13.26 |
+27:17:34.4 |
HIP 29510 |
8.80 |
| 2026-02-05 00:00 |
06:12:59.95 |
+27:17:33.3 |
HIP 29510 |
8.36 |
| 2026-02-05 12:00 |
06:12:46.90 |
+27:17:31.9 |
HIP 29510 |
8.92 |
| 2026-02-06 00:00 |
06:12:34.13 |
+27:17:30.1 |
HIP 29510 |
10.26 |
| 2026-02-06 12:00 |
06:12:21.64 |
+27:17:28.0 |
HIP 29510 |
12.09 |
| 2026-02-07 00:00 |
06:12:09.42 |
+27:17:25.6 |
HIP 29510 |
14.19 |
| 2026-02-07 12:00 |
06:11:57.47 |
+27:17:22.8 |
HIP 29510 |
16.41 |
| 2026-02-08 00:00 |
06:11:45.81 |
+27:17:19.7 |
HIP 29510 |
18.70 |
| 2026-02-08 12:00 |
06:11:34.42 |
+27:17:16.3 |
HIP 29510 |
21.00 |
| 2026-02-09 00:00 |
06:11:23.32 |
+27:17:12.6 |
HIP 29510 |
23.29 |
| 2026-02-09 12:00 |
06:11:12.49 |
+27:17:08.6 |
HIP 29188 |
24.18 |
| 2026-02-10 00:00 |
06:11:01.95 |
+27:17:04.3 |
HIP 29188 |
21.89 |
| 2026-02-10 12:00 |
06:10:51.69 |
+27:16:59.7 |
HIP 29188 |
19.67 |
| 2026-02-11 00:00 |
06:10:41.71 |
+27:16:54.8 |
HIP 29188 |
17.52 |
| 2026-02-11 12:00 |
06:10:32.02 |
+27:16:49.7 |
HIP 29188 |
15.45 |
| 2026-02-12 00:00 |
06:10:22.60 |
+27:16:44.3 |
HIP 29188 |
13.46 |
| 2026-02-12 12:00 |
06:10:13.48 |
+27:16:38.6 |
HIP 29188 |
11.57 |
| 2026-02-13 00:00 |
06:10:04.64 |
+27:16:32.7 |
HIP 29188 |
9.79 |
| 2026-02-13 12:00 |
06:09:56.08 |
+27:16:26.5 |
HIP 29188 |
8.14 |
| 2026-02-14 00:00 |
06:09:47.81 |
+27:16:20.2 |
HIP 29188 |
6.67 |
| 2026-02-14 12:00 |
06:09:39.83 |
+27:16:13.5 |
HIP 29188 |
5.46 |
| 2026-02-15 00:00 |
06:09:32.13 |
+27:16:06.7 |
HIP 29188 |
4.65 |
| 2026-02-15 12:00 |
06:09:24.73 |
+27:15:59.6 |
HIP 29188 |
4.38 |
| 2026-02-16 00:00 |
06:09:17.60 |
+27:15:52.3 |
HIP 29188 |
4.68 |
| 2026-02-16 12:00 |
06:09:10.77 |
+27:15:44.9 |
HIP 29188 |
5.41 |
| 2026-02-17 00:00 |
06:09:04.22 |
+27:15:37.2 |
HIP 29188 |
6.37 |
| 2026-02-17 12:00 |
06:08:57.96 |
+27:15:29.3 |
HIP 29188 |
7.43 |
| 2026-02-18 00:00 |
06:08:51.99 |
+27:15:21.2 |
HIP 29188 |
8.54 |
| 2026-02-18 12:00 |
06:08:46.30 |
+27:15:12.9 |
HIP 29188 |
9.64 |
| 2026-02-19 00:00 |
06:08:40.91 |
+27:15:04.5 |
HIP 29188 |
10.72 |
| 2026-02-19 12:00 |
06:08:35.80 |
+27:14:55.9 |
HIP 29188 |
11.76 |
| 2026-02-20 00:00 |
06:08:30.97 |
+27:14:47.1 |
HIP 29188 |
12.75 |
| 2026-02-20 12:00 |
06:08:26.43 |
+27:14:38.1 |
HIP 29074 |
12.63 |
| 2026-02-21 00:00 |
06:08:22.18 |
+27:14:29.0 |
HIP 29074 |
12.34 |
| 2026-02-21 12:00 |
06:08:18.22 |
+27:14:19.7 |
HIP 29074 |
12.15 |
| 2026-02-22 00:00 |
06:08:14.53 |
+27:14:10.3 |
HIP 29074 |
12.04 |
| 2026-02-22 12:00 |
06:08:11.14 |
+27:14:00.7 |
HIP 29074 |
12.00 |
| 2026-02-23 00:00 |
06:08:08.02 |
+27:13:51.0 |
HIP 29074 |
12.02 |
| 2026-02-23 12:00 |
06:08:05.19 |
+27:13:41.1 |
HIP 29074 |
12.10 |
| 2026-02-24 00:00 |
06:08:02.64 |
+27:13:31.1 |
HIP 29074 |
12.22 |