| 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) |
| 2026-06-01 00:00 |
08:04:45.18 |
+05:55:21.2 |
HIP 39591 |
11.31 |
| 2026-06-01 12:00 |
08:04:49.68 |
+05:55:25.6 |
HIP 39591 |
10.40 |
| 2026-06-02 00:00 |
08:04:54.21 |
+05:55:29.9 |
HIP 39591 |
9.52 |
| 2026-06-02 12:00 |
08:04:58.77 |
+05:55:33.8 |
HIP 39591 |
8.70 |
| 2026-06-03 00:00 |
08:05:03.36 |
+05:55:37.6 |
HIP 39591 |
7.95 |
| 2026-06-03 12:00 |
08:05:07.98 |
+05:55:41.1 |
HIP 39591 |
7.29 |
| 2026-06-04 00:00 |
08:05:12.63 |
+05:55:44.4 |
HIP 39591 |
6.76 |
| 2026-06-04 12:00 |
08:05:17.31 |
+05:55:47.5 |
HIP 39591 |
6.39 |
| 2026-06-05 00:00 |
08:05:22.02 |
+05:55:50.4 |
HIP 39591 |
6.22 |
| 2026-06-05 12:00 |
08:05:26.76 |
+05:55:53.0 |
HIP 39591 |
6.26 |
| 2026-06-06 00:00 |
08:05:31.53 |
+05:55:55.4 |
HIP 39591 |
6.52 |
| 2026-06-06 12:00 |
08:05:36.32 |
+05:55:57.5 |
HIP 39635 |
6.95 |
| 2026-06-07 00:00 |
08:05:41.15 |
+05:55:59.5 |
HIP 39635 |
5.99 |
| 2026-06-07 12:00 |
08:05:46.00 |
+05:56:01.2 |
HIP 39635 |
5.14 |
| 2026-06-08 00:00 |
08:05:50.89 |
+05:56:02.6 |
HIP 39635 |
4.45 |
| 2026-06-08 12:00 |
08:05:55.80 |
+05:56:03.9 |
HIP 39635 |
4.03 |
| 2026-06-09 00:00 |
08:06:00.73 |
+05:56:04.9 |
HIP 39635 |
3.95 |
| 2026-06-09 12:00 |
08:06:05.70 |
+05:56:05.7 |
HIP 39635 |
4.25 |
| 2026-06-10 00:00 |
08:06:10.69 |
+05:56:06.3 |
HIP 39635 |
4.86 |
| 2026-06-10 12:00 |
08:06:15.71 |
+05:56:06.6 |
HIP 39635 |
5.69 |
| 2026-06-11 00:00 |
08:06:20.75 |
+05:56:06.7 |
HIP 39635 |
6.66 |
| 2026-06-11 12:00 |
08:06:25.83 |
+05:56:06.6 |
HIP 39635 |
7.72 |
| 2026-06-12 00:00 |
08:06:30.92 |
+05:56:06.2 |
HIP 39635 |
8.84 |
| 2026-06-12 12:00 |
08:06:36.05 |
+05:56:05.6 |
HIP 39635 |
10.00 |
| 2026-06-13 00:00 |
08:06:41.19 |
+05:56:04.8 |
HIP 39635 |
11.19 |
| 2026-06-13 12:00 |
08:06:46.37 |
+05:56:03.8 |
HIP 39635 |
12.41 |
| 2026-06-14 00:00 |
08:06:51.56 |
+05:56:02.5 |
HIP 39635 |
13.65 |
| 2026-06-14 12:00 |
08:06:56.79 |
+05:56:01.0 |
HIP 39635 |
14.90 |
| 2026-06-15 00:00 |
08:07:02.03 |
+05:55:59.3 |
HIP 39635 |
16.17 |
| 2026-06-15 12:00 |
08:07:07.30 |
+05:55:57.3 |
HIP 39635 |
17.45 |
| 2026-06-16 00:00 |
08:07:12.59 |
+05:55:55.2 |
HIP 39635 |
18.74 |
| 2026-06-16 12:00 |
08:07:17.91 |
+05:55:52.7 |
HIP 39635 |
20.04 |
| 2026-06-17 00:00 |
08:07:23.25 |
+05:55:50.1 |
HIP 39635 |
21.35 |
| 2026-06-17 12:00 |
08:07:28.61 |
+05:55:47.2 |
HIP 39635 |
22.67 |
| 2026-06-18 00:00 |
08:07:33.99 |
+05:55:44.2 |
HIP 39635 |
23.99 |
| 2026-06-18 12:00 |
08:07:39.40 |
+05:55:40.9 |
HIP 39635 |
25.33 |
| 2026-06-19 00:00 |
08:07:44.82 |
+05:55:37.3 |
HIP 39635 |
26.67 |
| 2026-06-19 12:00 |
08:07:50.27 |
+05:55:33.6 |
HIP 39954 |
25.37 |
| 2026-06-20 00:00 |
08:07:55.74 |
+05:55:29.6 |
HIP 39954 |
24.01 |
| 2026-06-20 12:00 |
08:08:01.22 |
+05:55:25.4 |
HIP 39954 |
22.64 |
| 2026-06-21 00:00 |
08:08:06.73 |
+05:55:20.9 |
HIP 39954 |
21.27 |
| 2026-06-21 12:00 |
08:08:12.26 |
+05:55:16.3 |
HIP 39954 |
19.90 |
| 2026-06-22 00:00 |
08:08:17.81 |
+05:55:11.4 |
HIP 39954 |
18.52 |