C/2014 W9 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2014 W9 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-15T16:56:21.163200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
13.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-01-29.0000000 |
| e |
0.85784434 |
| q (au) |
1.587455 |
| a (au) |
11.167021 |
| i (deg) |
10.630531 |
| Ω (om, deg) |
21.288616 |
| ω (w, deg) |
167.769440 |
| M (ma, deg) |
359.532358 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.130 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.130 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.833 |
| k |
0.986 |
| 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 |
23:49:58.04 |
-05:38:04.4 |
HIP 117495 |
8.00 |
| 2026-02-03 12:00 |
23:50:02.74 |
-05:37:27.4 |
HIP 117495 |
8.64 |
| 2026-02-04 00:00 |
23:50:07.48 |
-05:36:50.2 |
HIP 117495 |
9.42 |
| 2026-02-04 12:00 |
23:50:12.25 |
-05:36:12.8 |
HIP 117495 |
10.32 |
| 2026-02-05 00:00 |
23:50:17.05 |
-05:35:35.3 |
HIP 117495 |
11.32 |
| 2026-02-05 12:00 |
23:50:21.87 |
-05:34:57.7 |
HIP 117495 |
12.39 |
| 2026-02-06 00:00 |
23:50:26.73 |
-05:34:19.9 |
HIP 117495 |
13.52 |
| 2026-02-06 12:00 |
23:50:31.62 |
-05:33:41.9 |
HIP 117495 |
14.70 |
| 2026-02-07 00:00 |
23:50:36.53 |
-05:33:03.9 |
HIP 117495 |
15.91 |
| 2026-02-07 12:00 |
23:50:41.48 |
-05:32:25.7 |
HIP 117495 |
17.16 |
| 2026-02-08 00:00 |
23:50:46.45 |
-05:31:47.3 |
HIP 117662 |
17.24 |
| 2026-02-08 12:00 |
23:50:51.45 |
-05:31:08.8 |
HIP 117662 |
16.56 |
| 2026-02-09 00:00 |
23:50:56.48 |
-05:30:30.2 |
HIP 117662 |
15.97 |
| 2026-02-09 12:00 |
23:51:01.54 |
-05:29:51.5 |
HIP 117662 |
15.48 |
| 2026-02-10 00:00 |
23:51:06.63 |
-05:29:12.7 |
HIP 117662 |
15.11 |
| 2026-02-10 12:00 |
23:51:11.74 |
-05:28:33.7 |
HIP 117662 |
14.86 |
| 2026-02-11 00:00 |
23:51:16.87 |
-05:27:54.6 |
HIP 117662 |
14.74 |
| 2026-02-11 12:00 |
23:51:22.04 |
-05:27:15.4 |
HIP 117662 |
14.77 |
| 2026-02-12 00:00 |
23:51:27.23 |
-05:26:36.0 |
HIP 117662 |
14.93 |
| 2026-02-12 12:00 |
23:51:32.44 |
-05:25:56.6 |
HIP 117662 |
15.23 |
| 2026-02-13 00:00 |
23:51:37.69 |
-05:25:17.0 |
HIP 117662 |
15.66 |
| 2026-02-13 12:00 |
23:51:42.95 |
-05:24:37.4 |
HIP 117662 |
16.22 |
| 2026-02-14 00:00 |
23:51:48.24 |
-05:23:57.6 |
HIP 117662 |
16.88 |
| 2026-02-14 12:00 |
23:51:53.56 |
-05:23:17.7 |
HIP 117662 |
17.65 |
| 2026-02-15 00:00 |
23:51:58.90 |
-05:22:37.8 |
HIP 117780 |
17.37 |
| 2026-02-15 12:00 |
23:52:04.26 |
-05:21:57.7 |
HIP 117780 |
15.96 |
| 2026-02-16 00:00 |
23:52:09.64 |
-05:21:17.5 |
HIP 117780 |
14.56 |
| 2026-02-16 12:00 |
23:52:15.05 |
-05:20:37.3 |
HIP 117780 |
13.18 |
| 2026-02-17 00:00 |
23:52:20.48 |
-05:19:56.9 |
HIP 117780 |
11.81 |
| 2026-02-17 12:00 |
23:52:25.93 |
-05:19:16.5 |
HIP 117780 |
10.49 |
| 2026-02-18 00:00 |
23:52:31.41 |
-05:18:36.0 |
HIP 117780 |
9.21 |
| 2026-02-18 12:00 |
23:52:36.90 |
-05:17:55.3 |
HIP 117780 |
8.02 |
| 2026-02-19 00:00 |
23:52:42.42 |
-05:17:14.7 |
HIP 117780 |
6.96 |
| 2026-02-19 12:00 |
23:52:47.96 |
-05:16:33.9 |
HIP 117780 |
6.09 |
| 2026-02-20 00:00 |
23:52:53.51 |
-05:15:53.0 |
HIP 117780 |
5.53 |
| 2026-02-20 12:00 |
23:52:59.09 |
-05:15:12.1 |
HIP 117780 |
5.36 |
| 2026-02-21 00:00 |
23:53:04.69 |
-05:14:31.2 |
HIP 117780 |
5.62 |
| 2026-02-21 12:00 |
23:53:10.30 |
-05:13:50.1 |
HIP 117780 |
6.28 |
| 2026-02-22 00:00 |
23:53:15.94 |
-05:13:09.0 |
HIP 117780 |
7.21 |
| 2026-02-22 12:00 |
23:53:21.59 |
-05:12:27.8 |
HIP 117780 |
8.34 |
| 2026-02-23 00:00 |
23:53:27.26 |
-05:11:46.6 |
HIP 117780 |
9.60 |
| 2026-02-23 12:00 |
23:53:32.94 |
-05:11:05.3 |
HIP 117780 |
10.94 |
| 2026-02-24 00:00 |
23:53:38.65 |
-05:10:23.9 |
HIP 117780 |
12.34 |