| 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) |
| 2026-07-29 00:00 |
08:15:40.40 |
+05:39:44.6 |
HIP 40428 |
8.75 |
| 2026-07-29 12:00 |
08:15:46.52 |
+05:39:25.2 |
HIP 40428 |
9.67 |
| 2026-07-30 00:00 |
08:15:52.63 |
+05:39:05.6 |
HIP 40428 |
10.74 |
| 2026-07-30 12:00 |
08:15:58.73 |
+05:38:45.9 |
HIP 40428 |
11.91 |
| 2026-07-31 00:00 |
08:16:04.83 |
+05:38:26.1 |
HIP 40428 |
13.16 |
| 2026-07-31 12:00 |
08:16:10.92 |
+05:38:06.1 |
HIP 40428 |
14.47 |
| 2026-08-01 00:00 |
08:16:17.01 |
+05:37:45.9 |
HIP 40428 |
15.82 |
| 2026-08-01 12:00 |
08:16:23.09 |
+05:37:25.6 |
HIP 40428 |
17.20 |
| 2026-08-02 00:00 |
08:16:29.17 |
+05:37:05.2 |
HIP 40428 |
18.60 |
| 2026-08-02 12:00 |
08:16:35.24 |
+05:36:44.6 |
HIP 40428 |
20.03 |
| 2026-08-03 00:00 |
08:16:41.30 |
+05:36:23.8 |
HIP 40428 |
21.47 |
| 2026-08-03 12:00 |
08:16:47.36 |
+05:36:02.9 |
HIP 40428 |
22.92 |
| 2026-08-04 00:00 |
08:16:53.41 |
+05:35:41.9 |
HIP 40428 |
24.38 |
| 2026-08-04 12:00 |
08:16:59.45 |
+05:35:20.7 |
HIP 40428 |
25.85 |
| 2026-08-05 00:00 |
08:17:05.48 |
+05:34:59.3 |
HIP 40428 |
27.33 |
| 2026-08-05 12:00 |
08:17:11.50 |
+05:34:37.8 |
HIP 40428 |
28.81 |
| 2026-08-06 00:00 |
08:17:17.52 |
+05:34:16.2 |
HIP 40689 |
29.02 |
| 2026-08-06 12:00 |
08:17:23.52 |
+05:33:54.5 |
HIP 40689 |
28.52 |
| 2026-08-07 00:00 |
08:17:29.52 |
+05:33:32.6 |
HIP 40704 |
27.41 |
| 2026-08-07 12:00 |
08:17:35.51 |
+05:33:10.5 |
HIP 40704 |
26.27 |
| 2026-08-08 00:00 |
08:17:41.49 |
+05:32:48.4 |
HIP 40704 |
25.17 |
| 2026-08-08 12:00 |
08:17:47.45 |
+05:32:26.0 |
HIP 40704 |
24.13 |
| 2026-08-09 00:00 |
08:17:53.41 |
+05:32:03.6 |
HIP 40704 |
23.13 |
| 2026-08-09 12:00 |
08:17:59.36 |
+05:31:41.0 |
HIP 40704 |
22.20 |
| 2026-08-10 00:00 |
08:18:05.29 |
+05:31:18.3 |
HIP 40704 |
21.33 |
| 2026-08-10 12:00 |
08:18:11.21 |
+05:30:55.5 |
HIP 40704 |
20.54 |
| 2026-08-11 00:00 |
08:18:17.12 |
+05:30:32.5 |
HIP 40704 |
19.83 |
| 2026-08-11 12:00 |
08:18:23.02 |
+05:30:09.4 |
HIP 40704 |
19.22 |
| 2026-08-12 00:00 |
08:18:28.91 |
+05:29:46.2 |
HIP 40704 |
18.70 |
| 2026-08-12 12:00 |
08:18:34.78 |
+05:29:22.9 |
HIP 40704 |
18.30 |
| 2026-08-13 00:00 |
08:18:40.64 |
+05:28:59.4 |
HIP 40704 |
18.01 |
| 2026-08-13 12:00 |
08:18:46.49 |
+05:28:35.9 |
HIP 40704 |
17.84 |
| 2026-08-14 00:00 |
08:18:52.32 |
+05:28:12.2 |
HIP 40704 |
17.80 |
| 2026-08-14 12:00 |
08:18:58.13 |
+05:27:48.4 |
HIP 40704 |
17.88 |
| 2026-08-15 00:00 |
08:19:03.94 |
+05:27:24.4 |
HIP 40704 |
18.08 |
| 2026-08-15 12:00 |
08:19:09.72 |
+05:27:00.4 |
HIP 40704 |
18.40 |
| 2026-08-16 00:00 |
08:19:15.50 |
+05:26:36.2 |
HIP 40704 |
18.82 |
| 2026-08-16 12:00 |
08:19:21.25 |
+05:26:12.0 |
HIP 40704 |
19.35 |
| 2026-08-17 00:00 |
08:19:26.99 |
+05:25:47.6 |
HIP 40704 |
19.98 |
| 2026-08-17 12:00 |
08:19:32.72 |
+05:25:23.1 |
HIP 40704 |
20.68 |
| 2026-08-18 00:00 |
08:19:38.42 |
+05:24:58.5 |
HIP 40892 |
20.75 |
| 2026-08-18 12:00 |
08:19:44.11 |
+05:24:33.9 |
HIP 40892 |
19.42 |
| 2026-08-19 00:00 |
08:19:49.79 |
+05:24:09.1 |
HIP 40892 |
18.12 |