513P/Broughton
| Parameter |
Value |
| Designation |
513P/Broughton |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-06-16T07:21:38.171520Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:54Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
19.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-03-25.0000000 |
| e |
0.55079452 |
| q (au) |
3.276271 |
| a (au) |
7.293480 |
| i (deg) |
21.336906 |
| Ω (om, deg) |
57.023900 |
| ω (w, deg) |
304.483984 |
| M (ma, deg) |
246.147688 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.345 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.345 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.699 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
02:05:56.38 |
+09:03:21.9 |
HIP 9838 |
23.22 |
| 2026-02-03 12:00 |
02:06:17.69 |
+09:07:34.6 |
HIP 9810 |
18.82 |
| 2026-02-04 00:00 |
02:06:39.16 |
+09:11:47.4 |
HIP 9810 |
15.95 |
| 2026-02-04 12:00 |
02:07:00.81 |
+09:16:00.2 |
HIP 9810 |
15.71 |
| 2026-02-05 00:00 |
02:07:22.61 |
+09:20:13.1 |
HIP 9810 |
18.25 |
| 2026-02-05 12:00 |
02:07:44.58 |
+09:24:26.0 |
HIP 9810 |
22.68 |
| 2026-02-06 00:00 |
02:08:06.71 |
+09:28:39.0 |
HIP 9810 |
28.15 |
| 2026-02-06 12:00 |
02:08:29.00 |
+09:32:52.1 |
HIP 9810 |
34.17 |
| 2026-02-07 00:00 |
02:08:51.45 |
+09:37:05.1 |
HIP 10168 |
30.97 |
| 2026-02-07 12:00 |
02:09:14.06 |
+09:41:18.2 |
HIP 10168 |
28.26 |
| 2026-02-08 00:00 |
02:09:36.83 |
+09:45:31.3 |
HIP 10168 |
27.12 |
| 2026-02-08 12:00 |
02:09:59.75 |
+09:49:44.5 |
HIP 10168 |
27.74 |
| 2026-02-09 00:00 |
02:10:22.83 |
+09:53:57.6 |
HIP 10168 |
30.05 |
| 2026-02-09 12:00 |
02:10:46.07 |
+09:58:10.8 |
HIP 10288 |
33.44 |
| 2026-02-10 00:00 |
02:11:09.45 |
+10:02:23.9 |
HIP 10288 |
26.33 |
| 2026-02-10 12:00 |
02:11:32.99 |
+10:06:37.1 |
HIP 10288 |
19.20 |
| 2026-02-11 00:00 |
02:11:56.68 |
+10:10:50.2 |
HIP 10288 |
12.09 |
| 2026-02-11 12:00 |
02:12:20.52 |
+10:15:03.4 |
HIP 10288 |
5.22 |
| 2026-02-12 00:00 |
02:12:44.51 |
+10:19:16.5 |
HIP 10288 |
3.60 |
| 2026-02-12 12:00 |
02:13:08.65 |
+10:23:29.6 |
HIP 10288 |
10.23 |
| 2026-02-13 00:00 |
02:13:32.93 |
+10:27:42.6 |
HIP 10288 |
17.42 |
| 2026-02-13 12:00 |
02:13:57.36 |
+10:31:55.7 |
HIP 10288 |
24.71 |
| 2026-02-14 00:00 |
02:14:21.94 |
+10:36:08.7 |
HIP 10530 |
21.94 |
| 2026-02-14 12:00 |
02:14:46.66 |
+10:40:21.6 |
HIP 10530 |
14.64 |
| 2026-02-15 00:00 |
02:15:11.52 |
+10:44:34.5 |
HIP 10530 |
7.51 |
| 2026-02-15 12:00 |
02:15:36.52 |
+10:48:47.4 |
HIP 10533 |
2.89 |
| 2026-02-16 00:00 |
02:16:01.67 |
+10:53:00.1 |
HIP 10533 |
8.25 |
| 2026-02-16 12:00 |
02:16:26.95 |
+10:57:12.9 |
HIP 10533 |
15.50 |
| 2026-02-17 00:00 |
02:16:52.37 |
+11:01:25.5 |
HIP 10533 |
22.93 |
| 2026-02-17 12:00 |
02:17:17.93 |
+11:05:38.1 |
HIP 10752 |
25.48 |
| 2026-02-18 00:00 |
02:17:43.62 |
+11:09:50.6 |
HIP 10752 |
26.34 |
| 2026-02-18 12:00 |
02:18:09.45 |
+11:14:03.0 |
HIP 10752 |
29.20 |
| 2026-02-19 00:00 |
02:18:35.42 |
+11:18:15.3 |
HIP 10752 |
33.58 |
| 2026-02-19 12:00 |
02:19:01.51 |
+11:22:27.4 |
HIP 10825 |
36.34 |
| 2026-02-20 00:00 |
02:19:27.74 |
+11:26:39.5 |
HIP 10825 |
31.89 |
| 2026-02-20 12:00 |
02:19:54.10 |
+11:30:51.5 |
HIP 10825 |
28.83 |
| 2026-02-21 00:00 |
02:20:20.59 |
+11:35:03.4 |
HIP 10825 |
27.65 |
| 2026-02-21 12:00 |
02:20:47.20 |
+11:39:15.1 |
HIP 10825 |
28.62 |
| 2026-02-22 00:00 |
02:21:13.94 |
+11:43:26.7 |
HIP 10825 |
31.55 |
| 2026-02-22 12:00 |
02:21:40.81 |
+11:47:38.2 |
HIP 11019 |
28.07 |
| 2026-02-23 00:00 |
02:22:07.80 |
+11:51:49.5 |
HIP 11019 |
24.03 |
| 2026-02-23 12:00 |
02:22:34.92 |
+11:56:00.7 |
HIP 11019 |
22.13 |
| 2026-02-24 00:00 |
02:23:02.16 |
+12:00:11.7 |
HIP 11019 |
22.93 |