C/2011 KP36 (Spacewatch)
| 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
$$
M_a = (2.585 + 4.026\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.585 |
| n |
4.026 |
| gf |
0.978 |
| gb |
-0.729 |
| k |
1.000 |
| δ90 |
9.997 |
| 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 |
+6.8509 |
-5.054 |
| 2016-06-09 |
2017-08-09 |
-12.8316 |
+9.020 |
| 2017-08-09 |
2018-02-11 |
+15.4913 |
-12.815 |
| 2018-02-11 |
2018-12-12 |
+5.2527 |
-4.671 |
| 2018-12-12 |
2019-12-09 |
-11.8223 |
+10.873 |
| 2019-12-09 |
2020-12-25 |
+19.8531 |
-19.966 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:06:57.25 |
+04:24:59.2 |
HIP 39786 |
27.90 |
| 2026-02-03 12:00 |
08:06:52.18 |
+04:25:24.2 |
HIP 39786 |
28.87 |
| 2026-02-04 00:00 |
08:06:47.13 |
+04:25:49.3 |
HIP 39786 |
29.88 |
| 2026-02-04 12:00 |
08:06:42.09 |
+04:26:14.6 |
HIP 39786 |
30.90 |
| 2026-02-05 00:00 |
08:06:37.07 |
+04:26:40.1 |
HIP 39544 |
31.94 |
| 2026-02-05 12:00 |
08:06:32.07 |
+04:27:05.7 |
HIP 39544 |
31.18 |
| 2026-02-06 00:00 |
08:06:27.08 |
+04:27:31.5 |
HIP 39544 |
30.46 |
| 2026-02-06 12:00 |
08:06:22.12 |
+04:27:57.4 |
HIP 39544 |
29.78 |
| 2026-02-07 00:00 |
08:06:17.17 |
+04:28:23.5 |
HIP 39544 |
29.15 |
| 2026-02-07 12:00 |
08:06:12.24 |
+04:28:49.7 |
HIP 39544 |
28.58 |
| 2026-02-08 00:00 |
08:06:07.33 |
+04:29:16.1 |
HIP 39544 |
28.05 |
| 2026-02-08 12:00 |
08:06:02.44 |
+04:29:42.6 |
HIP 39544 |
27.59 |
| 2026-02-09 00:00 |
08:05:57.57 |
+04:30:09.3 |
HIP 39544 |
27.18 |
| 2026-02-09 12:00 |
08:05:52.72 |
+04:30:36.1 |
HIP 39544 |
26.84 |
| 2026-02-10 00:00 |
08:05:47.89 |
+04:31:03.0 |
HIP 39544 |
26.55 |
| 2026-02-10 12:00 |
08:05:43.08 |
+04:31:30.1 |
HIP 39544 |
26.34 |
| 2026-02-11 00:00 |
08:05:38.30 |
+04:31:57.3 |
HIP 39544 |
26.18 |
| 2026-02-11 12:00 |
08:05:33.54 |
+04:32:24.7 |
HIP 39544 |
26.10 |
| 2026-02-12 00:00 |
08:05:28.80 |
+04:32:52.1 |
HIP 39544 |
26.08 |
| 2026-02-12 12:00 |
08:05:24.09 |
+04:33:19.7 |
HIP 39544 |
26.12 |
| 2026-02-13 00:00 |
08:05:19.40 |
+04:33:47.4 |
HIP 39544 |
26.23 |
| 2026-02-13 12:00 |
08:05:14.73 |
+04:34:15.3 |
HIP 39544 |
26.40 |
| 2026-02-14 00:00 |
08:05:10.09 |
+04:34:43.2 |
HIP 39544 |
26.63 |
| 2026-02-14 12:00 |
08:05:05.48 |
+04:35:11.3 |
HIP 39544 |
26.92 |
| 2026-02-15 00:00 |
08:05:00.89 |
+04:35:39.5 |
HIP 39544 |
27.27 |
| 2026-02-15 12:00 |
08:04:56.33 |
+04:36:07.8 |
HIP 39544 |
27.67 |
| 2026-02-16 00:00 |
08:04:51.80 |
+04:36:36.2 |
HIP 39544 |
28.12 |
| 2026-02-16 12:00 |
08:04:47.30 |
+04:37:04.7 |
HIP 39544 |
28.61 |
| 2026-02-17 00:00 |
08:04:42.82 |
+04:37:33.3 |
HIP 39544 |
29.15 |
| 2026-02-17 12:00 |
08:04:38.37 |
+04:38:02.0 |
HIP 39544 |
29.73 |
| 2026-02-18 00:00 |
08:04:33.95 |
+04:38:30.8 |
HIP 39544 |
30.35 |
| 2026-02-18 12:00 |
08:04:29.56 |
+04:38:59.7 |
HIP 39544 |
31.00 |
| 2026-02-19 00:00 |
08:04:25.20 |
+04:39:28.7 |
HIP 39544 |
31.69 |
| 2026-02-19 12:00 |
08:04:20.87 |
+04:39:57.7 |
HIP 39544 |
32.40 |
| 2026-02-20 00:00 |
08:04:16.57 |
+04:40:26.9 |
HIP 39544 |
33.14 |
| 2026-02-20 12:00 |
08:04:12.30 |
+04:40:56.1 |
HIP 39544 |
33.90 |
| 2026-02-21 00:00 |
08:04:08.07 |
+04:41:25.5 |
HIP 39280 |
34.20 |
| 2026-02-21 12:00 |
08:04:03.87 |
+04:41:54.9 |
HIP 39280 |
33.32 |
| 2026-02-22 00:00 |
08:03:59.69 |
+04:42:24.3 |
HIP 39280 |
32.47 |
| 2026-02-22 12:00 |
08:03:55.56 |
+04:42:53.9 |
HIP 39280 |
31.65 |
| 2026-02-23 00:00 |
08:03:51.45 |
+04:43:23.5 |
HIP 39280 |
30.86 |
| 2026-02-23 12:00 |
08:03:47.38 |
+04:43:53.1 |
HIP 39280 |
30.09 |
| 2026-02-24 00:00 |
08:03:43.34 |
+04:44:22.9 |
HIP 39280 |
29.36 |