| Parameter |
Value |
| Designation |
513P/Broughton |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-06-16T07:21:38.180160Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T02:53:17Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
19.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-09-24T09:49:32.505600Z |
| Discovery magnitude (MPC) |
19.56 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
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
$$
M_a = (13.105 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.105 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.738 |
| 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) |
| 2026-09-20 00:00 |
06:01:32.58 |
+31:15:41.9 |
HIP 28575 |
5.48 |
| 2026-09-20 12:00 |
06:01:46.78 |
+31:17:38.7 |
HIP 28575 |
2.13 |
| 2026-09-21 00:00 |
06:02:00.76 |
+31:19:35.7 |
HIP 28575 |
2.18 |
| 2026-09-21 12:00 |
06:02:14.53 |
+31:21:33.0 |
HIP 28575 |
5.48 |
| 2026-09-22 00:00 |
06:02:28.07 |
+31:23:30.5 |
HIP 28575 |
8.91 |
| 2026-09-22 12:00 |
06:02:41.39 |
+31:25:28.2 |
HIP 28683 |
8.85 |
| 2026-09-23 00:00 |
06:02:54.49 |
+31:27:26.2 |
HIP 28683 |
7.07 |
| 2026-09-23 12:00 |
06:03:07.37 |
+31:29:24.4 |
HIP 28683 |
6.74 |
| 2026-09-24 00:00 |
06:03:20.02 |
+31:31:22.9 |
HIP 28683 |
7.98 |
| 2026-09-24 12:00 |
06:03:32.45 |
+31:33:21.6 |
HIP 28683 |
10.21 |
| 2026-09-25 00:00 |
06:03:44.65 |
+31:35:20.6 |
HIP 28683 |
12.89 |
| 2026-09-25 12:00 |
06:03:56.63 |
+31:37:19.8 |
HIP 28683 |
15.78 |
| 2026-09-26 00:00 |
06:04:08.37 |
+31:39:19.2 |
HIP 28683 |
18.76 |
| 2026-09-26 12:00 |
06:04:19.89 |
+31:41:18.9 |
HIP 28683 |
21.77 |
| 2026-09-27 00:00 |
06:04:31.17 |
+31:43:18.9 |
HIP 28890 |
23.04 |
| 2026-09-27 12:00 |
06:04:42.23 |
+31:45:19.1 |
HIP 28890 |
19.96 |
| 2026-09-28 00:00 |
06:04:53.05 |
+31:47:19.5 |
HIP 28890 |
16.93 |
| 2026-09-28 12:00 |
06:05:03.63 |
+31:49:20.2 |
HIP 28890 |
13.93 |
| 2026-09-29 00:00 |
06:05:13.98 |
+31:51:21.2 |
HIP 28890 |
11.00 |
| 2026-09-29 12:00 |
06:05:24.10 |
+31:53:22.4 |
HIP 28890 |
8.14 |
| 2026-09-30 00:00 |
06:05:33.97 |
+31:55:23.8 |
HIP 28890 |
5.42 |
| 2026-09-30 12:00 |
06:05:43.61 |
+31:57:25.5 |
HIP 28890 |
3.14 |
| 2026-10-01 00:00 |
06:05:53.00 |
+31:59:27.5 |
HIP 28890 |
2.66 |
| 2026-10-01 12:00 |
06:06:02.16 |
+32:01:29.7 |
HIP 28919 |
3.32 |
| 2026-10-02 00:00 |
06:06:11.07 |
+32:03:32.1 |
HIP 28919 |
3.84 |
| 2026-10-02 12:00 |
06:06:19.74 |
+32:05:34.8 |
HIP 28919 |
5.82 |
| 2026-10-03 00:00 |
06:06:28.16 |
+32:07:37.8 |
HIP 28919 |
8.24 |
| 2026-10-03 12:00 |
06:06:36.34 |
+32:09:41.0 |
HIP 28919 |
10.79 |
| 2026-10-04 00:00 |
06:06:44.27 |
+32:11:44.4 |
HIP 28919 |
13.37 |
| 2026-10-04 12:00 |
06:06:51.95 |
+32:13:48.1 |
HIP 28919 |
15.95 |
| 2026-10-05 00:00 |
06:06:59.37 |
+32:15:52.0 |
HIP 28919 |
18.52 |
| 2026-10-05 12:00 |
06:07:06.55 |
+32:17:56.2 |
HIP 28974 |
20.87 |
| 2026-10-06 00:00 |
06:07:13.48 |
+32:20:00.6 |
HIP 28974 |
19.11 |
| 2026-10-06 12:00 |
06:07:20.15 |
+32:22:05.3 |
HIP 28974 |
17.51 |
| 2026-10-07 00:00 |
06:07:26.56 |
+32:24:10.1 |
HIP 28974 |
16.12 |
| 2026-10-07 12:00 |
06:07:32.73 |
+32:26:15.3 |
HIP 28974 |
14.98 |
| 2026-10-08 00:00 |
06:07:38.63 |
+32:28:20.6 |
HIP 28974 |
14.14 |
| 2026-10-08 12:00 |
06:07:44.28 |
+32:30:26.2 |
HIP 28974 |
13.64 |
| 2026-10-09 00:00 |
06:07:49.66 |
+32:32:32.0 |
HIP 28974 |
13.50 |
| 2026-10-09 12:00 |
06:07:54.79 |
+32:34:38.0 |
HIP 28974 |
13.73 |
| 2026-10-10 00:00 |
06:07:59.66 |
+32:36:44.2 |
HIP 28974 |
14.29 |
| 2026-10-10 12:00 |
06:08:04.27 |
+32:38:50.7 |
HIP 28974 |
15.14 |
| 2026-10-11 00:00 |
06:08:08.61 |
+32:40:57.3 |
HIP 28974 |
16.22 |