C/2015 D5 (Kowalski)
| Parameter |
Value |
| Designation |
C/2015 D5 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-04-17T01:46:07.006080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:07Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-03-06.0000000 |
| e |
0.49964849 |
| q (au) |
4.577343 |
| a (au) |
9.148254 |
| i (deg) |
20.399803 |
| Ω (om, deg) |
74.578267 |
| ω (w, deg) |
40.175332 |
| M (ma, deg) |
11.502709 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.465 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.465 |
| n |
2.000 |
| gf |
0.872 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
6.948 |
| 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 |
19:14:16.97 |
-32:18:45.1 |
HIP 94595 |
11.24 |
| 2026-02-03 12:00 |
19:14:27.86 |
-32:18:45.0 |
HIP 94595 |
9.41 |
| 2026-02-04 00:00 |
19:14:38.72 |
-32:18:45.1 |
HIP 94595 |
7.84 |
| 2026-02-04 12:00 |
19:14:49.54 |
-32:18:45.4 |
HIP 94595 |
6.70 |
| 2026-02-05 00:00 |
19:15:00.33 |
-32:18:45.8 |
HIP 94595 |
6.22 |
| 2026-02-05 12:00 |
19:15:11.08 |
-32:18:46.5 |
HIP 94595 |
6.55 |
| 2026-02-06 00:00 |
19:15:21.80 |
-32:18:47.3 |
HIP 94595 |
7.57 |
| 2026-02-06 12:00 |
19:15:32.48 |
-32:18:48.3 |
HIP 94595 |
9.04 |
| 2026-02-07 00:00 |
19:15:43.13 |
-32:18:49.4 |
HIP 94595 |
10.78 |
| 2026-02-07 12:00 |
19:15:53.73 |
-32:18:50.8 |
HIP 94595 |
12.67 |
| 2026-02-08 00:00 |
19:16:04.30 |
-32:18:52.4 |
HIP 94595 |
14.65 |
| 2026-02-08 12:00 |
19:16:14.83 |
-32:18:54.1 |
HIP 94595 |
16.69 |
| 2026-02-09 00:00 |
19:16:25.32 |
-32:18:56.0 |
HIP 94595 |
18.76 |
| 2026-02-09 12:00 |
19:16:35.77 |
-32:18:58.1 |
HIP 94595 |
20.85 |
| 2026-02-10 00:00 |
19:16:46.18 |
-32:19:00.4 |
HIP 94595 |
22.95 |
| 2026-02-10 12:00 |
19:16:56.56 |
-32:19:02.9 |
HIP 94595 |
25.06 |
| 2026-02-11 00:00 |
19:17:06.88 |
-32:19:05.6 |
HIP 94595 |
27.18 |
| 2026-02-11 12:00 |
19:17:17.17 |
-32:19:08.4 |
HIP 94595 |
29.29 |
| 2026-02-12 00:00 |
19:17:27.42 |
-32:19:11.5 |
HIP 94965 |
27.71 |
| 2026-02-12 12:00 |
19:17:37.62 |
-32:19:14.7 |
HIP 94965 |
25.68 |
| 2026-02-13 00:00 |
19:17:47.78 |
-32:19:18.2 |
HIP 94965 |
23.67 |
| 2026-02-13 12:00 |
19:17:57.89 |
-32:19:21.8 |
HIP 94965 |
21.69 |
| 2026-02-14 00:00 |
19:18:07.96 |
-32:19:25.7 |
HIP 94965 |
19.76 |
| 2026-02-14 12:00 |
19:18:17.99 |
-32:19:29.7 |
HIP 94965 |
17.88 |
| 2026-02-15 00:00 |
19:18:27.97 |
-32:19:34.0 |
HIP 94965 |
16.06 |
| 2026-02-15 12:00 |
19:18:37.90 |
-32:19:38.4 |
HIP 94965 |
14.33 |
| 2026-02-16 00:00 |
19:18:47.78 |
-32:19:43.0 |
HIP 94965 |
12.71 |
| 2026-02-16 12:00 |
19:18:57.62 |
-32:19:47.9 |
HIP 94965 |
11.26 |
| 2026-02-17 00:00 |
19:19:07.41 |
-32:19:52.9 |
HIP 94965 |
10.03 |
| 2026-02-17 12:00 |
19:19:17.15 |
-32:19:58.2 |
HIP 94965 |
9.10 |
| 2026-02-18 00:00 |
19:19:26.85 |
-32:20:03.7 |
HIP 94965 |
8.58 |
| 2026-02-18 12:00 |
19:19:36.49 |
-32:20:09.3 |
HIP 94965 |
8.52 |
| 2026-02-19 00:00 |
19:19:46.08 |
-32:20:15.2 |
HIP 94965 |
8.94 |
| 2026-02-19 12:00 |
19:19:55.62 |
-32:20:21.3 |
HIP 94965 |
9.75 |
| 2026-02-20 00:00 |
19:20:05.11 |
-32:20:27.6 |
HIP 94965 |
10.88 |
| 2026-02-20 12:00 |
19:20:14.55 |
-32:20:34.1 |
HIP 95102 |
11.68 |
| 2026-02-21 00:00 |
19:20:23.94 |
-32:20:40.8 |
HIP 95102 |
10.38 |
| 2026-02-21 12:00 |
19:20:33.27 |
-32:20:47.7 |
HIP 95102 |
9.32 |
| 2026-02-22 00:00 |
19:20:42.55 |
-32:20:54.9 |
HIP 95102 |
8.59 |
| 2026-02-22 12:00 |
19:20:51.78 |
-32:21:02.2 |
HIP 95102 |
8.27 |
| 2026-02-23 00:00 |
19:21:00.95 |
-32:21:09.8 |
HIP 95102 |
8.40 |
| 2026-02-23 12:00 |
19:21:10.07 |
-32:21:17.6 |
HIP 95102 |
8.94 |
| 2026-02-24 00:00 |
19:21:19.13 |
-32:21:25.6 |
HIP 95102 |
9.83 |