C/2015 K1 (MASTER)
| Parameter |
Value |
| Designation |
C/2015 K1 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-13T13:49:54.566400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:10Z |
| Obs used |
584 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
5.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-30.0000000 |
| e |
0.98583674 |
| q (au) |
2.557494 |
| a (au) |
180.572455 |
| i (deg) |
29.381729 |
| Ω (om, deg) |
5.177060 |
| ω (w, deg) |
280.196200 |
| M (ma, deg) |
0.130152 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.364 + 3.427\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.364 |
| n |
3.427 |
| gf |
0.946 |
| gb |
-0.917 |
| k |
0.999 |
| δ90 |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
03:41:06.19 |
+47:00:59.3 |
HIP 17278 |
21.74 |
| 2026-02-03 12:00 |
03:41:05.14 |
+47:00:27.2 |
HIP 17278 |
21.33 |
| 2026-02-04 00:00 |
03:41:04.15 |
+46:59:55.1 |
HIP 17278 |
20.93 |
| 2026-02-04 12:00 |
03:41:03.22 |
+46:59:23.1 |
HIP 17278 |
20.54 |
| 2026-02-05 00:00 |
03:41:02.35 |
+46:58:51.2 |
HIP 17278 |
20.14 |
| 2026-02-05 12:00 |
03:41:01.54 |
+46:58:19.3 |
HIP 17278 |
19.76 |
| 2026-02-06 00:00 |
03:41:00.79 |
+46:57:47.6 |
HIP 17278 |
19.37 |
| 2026-02-06 12:00 |
03:41:00.10 |
+46:57:15.9 |
HIP 17278 |
18.99 |
| 2026-02-07 00:00 |
03:40:59.46 |
+46:56:44.4 |
HIP 17278 |
18.61 |
| 2026-02-07 12:00 |
03:40:58.88 |
+46:56:12.9 |
HIP 17278 |
18.24 |
| 2026-02-08 00:00 |
03:40:58.36 |
+46:55:41.5 |
HIP 17278 |
17.86 |
| 2026-02-08 12:00 |
03:40:57.90 |
+46:55:10.3 |
HIP 17278 |
17.50 |
| 2026-02-09 00:00 |
03:40:57.50 |
+46:54:39.1 |
HIP 17278 |
17.13 |
| 2026-02-09 12:00 |
03:40:57.16 |
+46:54:08.1 |
HIP 17278 |
16.77 |
| 2026-02-10 00:00 |
03:40:56.87 |
+46:53:37.1 |
HIP 17278 |
16.41 |
| 2026-02-10 12:00 |
03:40:56.64 |
+46:53:06.3 |
HIP 17278 |
16.06 |
| 2026-02-11 00:00 |
03:40:56.48 |
+46:52:35.6 |
HIP 17278 |
15.71 |
| 2026-02-11 12:00 |
03:40:56.37 |
+46:52:05.0 |
HIP 17278 |
15.36 |
| 2026-02-12 00:00 |
03:40:56.32 |
+46:51:34.6 |
HIP 17278 |
15.02 |
| 2026-02-12 12:00 |
03:40:56.32 |
+46:51:04.2 |
HIP 17278 |
14.68 |
| 2026-02-13 00:00 |
03:40:56.39 |
+46:50:34.0 |
HIP 17278 |
14.34 |
| 2026-02-13 12:00 |
03:40:56.51 |
+46:50:03.9 |
HIP 17278 |
14.01 |
| 2026-02-14 00:00 |
03:40:56.70 |
+46:49:34.0 |
HIP 17278 |
13.68 |
| 2026-02-14 12:00 |
03:40:56.94 |
+46:49:04.1 |
HIP 17278 |
13.35 |
| 2026-02-15 00:00 |
03:40:57.24 |
+46:48:34.4 |
HIP 17278 |
13.03 |
| 2026-02-15 12:00 |
03:40:57.59 |
+46:48:04.9 |
HIP 17278 |
12.71 |
| 2026-02-16 00:00 |
03:40:58.01 |
+46:47:35.5 |
HIP 17278 |
12.39 |
| 2026-02-16 12:00 |
03:40:58.48 |
+46:47:06.2 |
HIP 17278 |
12.08 |
| 2026-02-17 00:00 |
03:40:59.01 |
+46:46:37.1 |
HIP 17278 |
11.78 |
| 2026-02-17 12:00 |
03:40:59.60 |
+46:46:08.1 |
HIP 17278 |
11.48 |
| 2026-02-18 00:00 |
03:41:00.25 |
+46:45:39.3 |
HIP 17278 |
11.18 |
| 2026-02-18 12:00 |
03:41:00.95 |
+46:45:10.7 |
HIP 17278 |
10.90 |
| 2026-02-19 00:00 |
03:41:01.71 |
+46:44:42.2 |
HIP 17278 |
10.61 |
| 2026-02-19 12:00 |
03:41:02.53 |
+46:44:13.8 |
HIP 17278 |
10.34 |
| 2026-02-20 00:00 |
03:41:03.41 |
+46:43:45.6 |
HIP 17278 |
10.07 |
| 2026-02-20 12:00 |
03:41:04.34 |
+46:43:17.6 |
HIP 17278 |
9.81 |
| 2026-02-21 00:00 |
03:41:05.33 |
+46:42:49.7 |
HIP 17278 |
9.56 |
| 2026-02-21 12:00 |
03:41:06.37 |
+46:42:22.0 |
HIP 17278 |
9.33 |
| 2026-02-22 00:00 |
03:41:07.48 |
+46:41:54.5 |
HIP 17278 |
9.10 |
| 2026-02-22 12:00 |
03:41:08.63 |
+46:41:27.2 |
HIP 17278 |
8.88 |
| 2026-02-23 00:00 |
03:41:09.85 |
+46:41:00.0 |
HIP 17278 |
8.68 |
| 2026-02-23 12:00 |
03:41:11.12 |
+46:40:33.0 |
HIP 17278 |
8.49 |
| 2026-02-24 00:00 |
03:41:12.45 |
+46:40:06.1 |
HIP 17278 |
8.32 |