| Parameter |
Value |
| Designation |
56P/Slaughter-Burnham |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-07-18T01:58:14.727360Z |
| Orbit solution date (soln_date, UTC) |
2023-10-16T10:35:53Z |
| Obs used |
1986 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-08-12.0000000 |
| e |
0.50729701 |
| q (au) |
2.505871 |
| a (au) |
5.085966 |
| i (deg) |
8.147198 |
| Ω (om, deg) |
346.037614 |
| ω (w, deg) |
44.217463 |
| M (ma, deg) |
267.962120 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.594 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.594 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2015-07-24 |
2016-07-15 |
+13.5328 |
-5.371 |
| 2016-07-20 |
2018-01-23 |
+3.6320 |
-1.563 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
18:40:19.36 |
-30:14:12.0 |
HIP 91478 |
12.42 |
| 2026-09-20 12:00 |
18:40:26.94 |
-30:12:54.7 |
HIP 91478 |
14.44 |
| 2026-09-21 00:00 |
18:40:34.80 |
-30:11:37.3 |
HIP 91478 |
16.53 |
| 2026-09-21 12:00 |
18:40:42.94 |
-30:10:19.7 |
HIP 91478 |
18.68 |
| 2026-09-22 00:00 |
18:40:51.35 |
-30:09:01.9 |
HIP 91478 |
20.90 |
| 2026-09-22 12:00 |
18:41:00.04 |
-30:07:43.9 |
HIP 91753 |
21.52 |
| 2026-09-23 00:00 |
18:41:09.00 |
-30:06:25.8 |
HIP 91753 |
19.99 |
| 2026-09-23 12:00 |
18:41:18.24 |
-30:05:07.4 |
HIP 91753 |
18.56 |
| 2026-09-24 00:00 |
18:41:27.75 |
-30:03:48.9 |
HIP 91753 |
17.30 |
| 2026-09-24 12:00 |
18:41:37.53 |
-30:02:30.2 |
HIP 91753 |
16.27 |
| 2026-09-25 00:00 |
18:41:47.58 |
-30:01:11.4 |
HIP 91753 |
15.52 |
| 2026-09-25 12:00 |
18:41:57.90 |
-29:59:52.3 |
HIP 91753 |
15.14 |
| 2026-09-26 00:00 |
18:42:08.48 |
-29:58:33.1 |
HIP 91753 |
15.17 |
| 2026-09-26 12:00 |
18:42:19.34 |
-29:57:13.7 |
HIP 91753 |
15.65 |
| 2026-09-27 00:00 |
18:42:30.46 |
-29:55:54.1 |
HIP 91753 |
16.55 |
| 2026-09-27 12:00 |
18:42:41.84 |
-29:54:34.4 |
HIP 91753 |
17.84 |
| 2026-09-28 00:00 |
18:42:53.49 |
-29:53:14.5 |
HIP 91753 |
19.47 |
| 2026-09-28 12:00 |
18:43:05.40 |
-29:51:54.4 |
HIP 91761 |
19.12 |
| 2026-09-29 00:00 |
18:43:17.57 |
-29:50:34.2 |
HIP 91761 |
18.72 |
| 2026-09-29 12:00 |
18:43:30.00 |
-29:49:13.8 |
HIP 91965 |
18.35 |
| 2026-09-30 00:00 |
18:43:42.69 |
-29:47:53.2 |
HIP 91965 |
16.91 |
| 2026-09-30 12:00 |
18:43:55.65 |
-29:46:32.4 |
HIP 91965 |
15.89 |
| 2026-10-01 00:00 |
18:44:08.86 |
-29:45:11.4 |
HIP 91991 |
14.37 |
| 2026-10-01 12:00 |
18:44:22.32 |
-29:43:50.3 |
HIP 91991 |
13.40 |
| 2026-10-02 00:00 |
18:44:36.04 |
-29:42:29.0 |
HIP 91991 |
13.15 |
| 2026-10-02 12:00 |
18:44:50.02 |
-29:41:07.5 |
HIP 91991 |
13.69 |
| 2026-10-03 00:00 |
18:45:04.25 |
-29:39:45.9 |
HIP 91991 |
14.98 |
| 2026-10-03 12:00 |
18:45:18.74 |
-29:38:24.1 |
HIP 91991 |
16.87 |
| 2026-10-04 00:00 |
18:45:33.47 |
-29:37:02.0 |
HIP 92142 |
16.06 |
| 2026-10-04 12:00 |
18:45:48.46 |
-29:35:39.8 |
HIP 92142 |
12.97 |
| 2026-10-05 00:00 |
18:46:03.70 |
-29:34:17.5 |
HIP 92134 |
9.52 |
| 2026-10-05 12:00 |
18:46:19.19 |
-29:32:54.9 |
HIP 92134 |
5.89 |
| 2026-10-06 00:00 |
18:46:34.93 |
-29:31:32.1 |
HIP 92134 |
2.25 |
| 2026-10-06 12:00 |
18:46:50.91 |
-29:30:09.2 |
HIP 92134 |
1.69 |
| 2026-10-07 00:00 |
18:47:07.14 |
-29:28:46.0 |
HIP 92134 |
5.41 |
| 2026-10-07 12:00 |
18:47:23.62 |
-29:27:22.7 |
HIP 92134 |
9.24 |
| 2026-10-08 00:00 |
18:47:40.34 |
-29:25:59.2 |
HIP 92134 |
13.13 |
| 2026-10-08 12:00 |
18:47:57.30 |
-29:24:35.4 |
HIP 92134 |
17.08 |
| 2026-10-09 00:00 |
18:48:14.50 |
-29:23:11.5 |
HIP 92134 |
21.08 |
| 2026-10-09 12:00 |
18:48:31.95 |
-29:21:47.4 |
HIP 92363 |
20.84 |
| 2026-10-10 00:00 |
18:48:49.63 |
-29:20:23.0 |
HIP 92363 |
17.65 |
| 2026-10-10 12:00 |
18:49:07.56 |
-29:18:58.5 |
HIP 92363 |
14.89 |
| 2026-10-11 00:00 |
18:49:25.72 |
-29:17:33.7 |
HIP 92363 |
12.90 |