| 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) |
| 2026-03-26 00:00 |
03:44:05.99 |
+46:19:35.0 |
HIP 17475 |
14.87 |
| 2026-03-26 12:00 |
03:44:10.29 |
+46:19:21.6 |
HIP 17475 |
14.38 |
| 2026-03-27 00:00 |
03:44:14.64 |
+46:19:08.4 |
HIP 17475 |
13.91 |
| 2026-03-27 12:00 |
03:44:19.02 |
+46:18:55.5 |
HIP 17475 |
13.48 |
| 2026-03-28 00:00 |
03:44:23.44 |
+46:18:42.8 |
HIP 17475 |
13.07 |
| 2026-03-28 12:00 |
03:44:27.91 |
+46:18:30.4 |
HIP 17475 |
12.71 |
| 2026-03-29 00:00 |
03:44:32.41 |
+46:18:18.2 |
HIP 17475 |
12.40 |
| 2026-03-29 12:00 |
03:44:36.95 |
+46:18:06.2 |
HIP 17475 |
12.13 |
| 2026-03-30 00:00 |
03:44:41.52 |
+46:17:54.5 |
HIP 17475 |
11.92 |
| 2026-03-30 12:00 |
03:44:46.14 |
+46:17:43.1 |
HIP 17475 |
11.76 |
| 2026-03-31 00:00 |
03:44:50.79 |
+46:17:31.9 |
HIP 17475 |
11.67 |
| 2026-03-31 12:00 |
03:44:55.48 |
+46:17:21.0 |
HIP 17475 |
11.63 |
| 2026-04-01 00:00 |
03:45:00.21 |
+46:17:10.3 |
HIP 17475 |
11.67 |
| 2026-04-01 12:00 |
03:45:04.97 |
+46:16:59.9 |
HIP 17475 |
11.77 |
| 2026-04-02 00:00 |
03:45:09.77 |
+46:16:49.7 |
HIP 17475 |
11.93 |
| 2026-04-02 12:00 |
03:45:14.61 |
+46:16:39.8 |
HIP 17475 |
12.16 |
| 2026-04-03 00:00 |
03:45:19.48 |
+46:16:30.1 |
HIP 17475 |
12.45 |
| 2026-04-03 12:00 |
03:45:24.38 |
+46:16:20.7 |
HIP 17475 |
12.80 |
| 2026-04-04 00:00 |
03:45:29.32 |
+46:16:11.6 |
HIP 17475 |
13.20 |
| 2026-04-04 12:00 |
03:45:34.30 |
+46:16:02.7 |
HIP 17475 |
13.65 |
| 2026-04-05 00:00 |
03:45:39.31 |
+46:15:54.0 |
HIP 17475 |
14.15 |
| 2026-04-05 12:00 |
03:45:44.35 |
+46:15:45.6 |
HIP 17475 |
14.70 |
| 2026-04-06 00:00 |
03:45:49.43 |
+46:15:37.5 |
HIP 17475 |
15.28 |
| 2026-04-06 12:00 |
03:45:54.54 |
+46:15:29.6 |
HIP 17475 |
15.90 |
| 2026-04-07 00:00 |
03:45:59.68 |
+46:15:22.0 |
HIP 17475 |
16.55 |
| 2026-04-07 12:00 |
03:46:04.86 |
+46:15:14.6 |
HIP 17475 |
17.23 |
| 2026-04-08 00:00 |
03:46:10.07 |
+46:15:07.5 |
HIP 17475 |
17.93 |
| 2026-04-08 12:00 |
03:46:15.31 |
+46:15:00.6 |
HIP 17475 |
18.66 |
| 2026-04-09 00:00 |
03:46:20.58 |
+46:14:54.0 |
HIP 17475 |
19.42 |
| 2026-04-09 12:00 |
03:46:25.89 |
+46:14:47.6 |
HIP 17475 |
20.19 |
| 2026-04-10 00:00 |
03:46:31.22 |
+46:14:41.5 |
HIP 17475 |
20.99 |
| 2026-04-10 12:00 |
03:46:36.59 |
+46:14:35.7 |
HIP 17475 |
21.80 |
| 2026-04-11 00:00 |
03:46:41.99 |
+46:14:30.1 |
HIP 17475 |
22.62 |
| 2026-04-11 12:00 |
03:46:47.41 |
+46:14:24.8 |
HIP 17665 |
22.75 |
| 2026-04-12 00:00 |
03:46:52.87 |
+46:14:19.7 |
HIP 17665 |
22.77 |
| 2026-04-12 12:00 |
03:46:58.36 |
+46:14:14.9 |
HIP 17665 |
22.82 |
| 2026-04-13 00:00 |
03:47:03.87 |
+46:14:10.4 |
HIP 17665 |
22.91 |
| 2026-04-13 12:00 |
03:47:09.41 |
+46:14:06.1 |
HIP 17665 |
23.03 |
| 2026-04-14 00:00 |
03:47:14.99 |
+46:14:02.0 |
HIP 17665 |
23.18 |
| 2026-04-14 12:00 |
03:47:20.59 |
+46:13:58.2 |
HIP 17665 |
23.37 |
| 2026-04-15 00:00 |
03:47:26.21 |
+46:13:54.7 |
HIP 17898 |
23.33 |
| 2026-04-15 12:00 |
03:47:31.87 |
+46:13:51.4 |
HIP 17898 |
22.36 |
| 2026-04-16 00:00 |
03:47:37.55 |
+46:13:48.4 |
HIP 17898 |
21.38 |