| Parameter |
Value |
| Designation |
C/2011 KP36 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-05-26T20:57:18.164160Z |
| Orbit solution date (soln_date, UTC) |
2023-05-10T17:42:22Z |
| Obs used |
3711 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
7.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-06-22.0000000 |
| e |
0.87286835 |
| q (au) |
4.883307 |
| a (au) |
38.411417 |
| i (deg) |
18.986783 |
| Ω (om, deg) |
173.400328 |
| ω (w, deg) |
180.594874 |
| M (ma, deg) |
0.108169 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.586 + 4.026\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.586 |
| n |
4.026 |
| gf |
0.999 |
| gb |
-0.998 |
| 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 |
| 2012-07-24 |
2015-11-05 |
+6.8520 |
-5.055 |
| 2016-06-09 |
2017-09-25 |
-12.0128 |
+8.443 |
| 2017-09-25 |
2020-12-25 |
+1.9651 |
-1.987 |
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 |
08:25:04.04 |
+04:55:23.2 |
HIP 41240 |
25.79 |
| 2026-09-20 12:00 |
08:25:07.99 |
+04:54:55.3 |
HIP 41240 |
26.37 |
| 2026-09-21 00:00 |
08:25:11.90 |
+04:54:27.4 |
HIP 41240 |
26.98 |
| 2026-09-21 12:00 |
08:25:15.77 |
+04:53:59.5 |
HIP 41240 |
27.62 |
| 2026-09-22 00:00 |
08:25:19.61 |
+04:53:31.6 |
HIP 41240 |
28.28 |
| 2026-09-22 12:00 |
08:25:23.41 |
+04:53:03.8 |
HIP 41240 |
28.96 |
| 2026-09-23 00:00 |
08:25:27.18 |
+04:52:36.0 |
HIP 41240 |
29.66 |
| 2026-09-23 12:00 |
08:25:30.90 |
+04:52:08.2 |
HIP 41240 |
30.37 |
| 2026-09-24 00:00 |
08:25:34.60 |
+04:51:40.4 |
HIP 41240 |
31.11 |
| 2026-09-24 12:00 |
08:25:38.25 |
+04:51:12.6 |
HIP 41240 |
31.85 |
| 2026-09-25 00:00 |
08:25:41.87 |
+04:50:44.9 |
HIP 41240 |
32.61 |
| 2026-09-25 12:00 |
08:25:45.45 |
+04:50:17.2 |
HIP 41509 |
32.58 |
| 2026-09-26 00:00 |
08:25:48.99 |
+04:49:49.5 |
HIP 41509 |
31.69 |
| 2026-09-26 12:00 |
08:25:52.50 |
+04:49:21.9 |
HIP 41509 |
30.81 |
| 2026-09-27 00:00 |
08:25:55.96 |
+04:48:54.3 |
HIP 41509 |
29.95 |
| 2026-09-27 12:00 |
08:25:59.39 |
+04:48:26.7 |
HIP 41509 |
29.10 |
| 2026-09-28 00:00 |
08:26:02.78 |
+04:47:59.2 |
HIP 41509 |
28.28 |
| 2026-09-28 12:00 |
08:26:06.14 |
+04:47:31.7 |
HIP 41509 |
27.47 |
| 2026-09-29 00:00 |
08:26:09.45 |
+04:47:04.3 |
HIP 41509 |
26.68 |
| 2026-09-29 12:00 |
08:26:12.72 |
+04:46:36.8 |
HIP 41509 |
25.91 |
| 2026-09-30 00:00 |
08:26:15.96 |
+04:46:09.5 |
HIP 41509 |
25.16 |
| 2026-09-30 12:00 |
08:26:19.15 |
+04:45:42.2 |
HIP 41509 |
24.43 |
| 2026-10-01 00:00 |
08:26:22.31 |
+04:45:14.9 |
HIP 41509 |
23.73 |
| 2026-10-01 12:00 |
08:26:25.43 |
+04:44:47.7 |
HIP 41509 |
23.05 |
| 2026-10-02 00:00 |
08:26:28.50 |
+04:44:20.5 |
HIP 41509 |
22.39 |
| 2026-10-02 12:00 |
08:26:31.54 |
+04:43:53.4 |
HIP 41509 |
21.76 |
| 2026-10-03 00:00 |
08:26:34.53 |
+04:43:26.4 |
HIP 41509 |
21.16 |
| 2026-10-03 12:00 |
08:26:37.48 |
+04:42:59.4 |
HIP 41509 |
20.59 |
| 2026-10-04 00:00 |
08:26:40.40 |
+04:42:32.4 |
HIP 41509 |
20.05 |
| 2026-10-04 12:00 |
08:26:43.27 |
+04:42:05.5 |
HIP 41509 |
19.53 |
| 2026-10-05 00:00 |
08:26:46.10 |
+04:41:38.7 |
HIP 41509 |
19.06 |
| 2026-10-05 12:00 |
08:26:48.89 |
+04:41:12.0 |
HIP 41509 |
18.61 |
| 2026-10-06 00:00 |
08:26:51.64 |
+04:40:45.3 |
HIP 41509 |
18.20 |
| 2026-10-06 12:00 |
08:26:54.34 |
+04:40:18.7 |
HIP 41509 |
17.83 |
| 2026-10-07 00:00 |
08:26:57.00 |
+04:39:52.2 |
HIP 41509 |
17.49 |
| 2026-10-07 12:00 |
08:26:59.62 |
+04:39:25.7 |
HIP 41509 |
17.19 |
| 2026-10-08 00:00 |
08:27:02.20 |
+04:38:59.3 |
HIP 41509 |
16.94 |
| 2026-10-08 12:00 |
08:27:04.73 |
+04:38:33.0 |
HIP 41509 |
16.72 |
| 2026-10-09 00:00 |
08:27:07.22 |
+04:38:06.8 |
HIP 41509 |
16.54 |
| 2026-10-09 12:00 |
08:27:09.67 |
+04:37:40.7 |
HIP 41509 |
16.40 |
| 2026-10-10 00:00 |
08:27:12.07 |
+04:37:14.6 |
HIP 41509 |
16.30 |
| 2026-10-10 12:00 |
08:27:14.43 |
+04:36:48.7 |
HIP 41509 |
16.24 |
| 2026-10-11 00:00 |
08:27:16.75 |
+04:36:22.8 |
HIP 41509 |
16.22 |