| Parameter |
Value |
| Designation |
C/2014 W7 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-12-31T14:55:39.754560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-12-11.0000000 |
| e |
0.86930062 |
| q (au) |
1.488259 |
| a (au) |
11.386888 |
| i (deg) |
98.313749 |
| Ω (om, deg) |
151.260997 |
| ω (w, deg) |
33.240158 |
| M (ma, deg) |
359.471035 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.710 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.710 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.988 |
| δ90 |
10.000 |
| 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 |
22:41:07.83 |
-30:41:21.6 |
HIP 111934 |
9.95 |
| 2026-03-26 12:00 |
22:41:13.88 |
-30:41:16.2 |
HIP 111934 |
11.21 |
| 2026-03-27 00:00 |
22:41:19.91 |
-30:41:11.2 |
HIP 111934 |
12.49 |
| 2026-03-27 12:00 |
22:41:25.92 |
-30:41:06.6 |
HIP 112101 |
12.06 |
| 2026-03-28 00:00 |
22:41:31.90 |
-30:41:02.3 |
HIP 112101 |
10.77 |
| 2026-03-28 12:00 |
22:41:37.86 |
-30:40:58.4 |
HIP 112101 |
9.49 |
| 2026-03-29 00:00 |
22:41:43.80 |
-30:40:54.9 |
HIP 112101 |
8.22 |
| 2026-03-29 12:00 |
22:41:49.70 |
-30:40:51.7 |
HIP 112101 |
6.95 |
| 2026-03-30 00:00 |
22:41:55.59 |
-30:40:48.9 |
HIP 112101 |
5.69 |
| 2026-03-30 12:00 |
22:42:01.44 |
-30:40:46.6 |
HIP 112101 |
4.44 |
| 2026-03-31 00:00 |
22:42:07.27 |
-30:40:44.5 |
HIP 112101 |
3.20 |
| 2026-03-31 12:00 |
22:42:13.08 |
-30:40:42.9 |
HIP 112101 |
1.97 |
| 2026-04-01 00:00 |
22:42:18.85 |
-30:40:41.6 |
HIP 112101 |
0.83 |
| 2026-04-01 12:00 |
22:42:24.60 |
-30:40:40.7 |
HIP 112101 |
0.75 |
| 2026-04-02 00:00 |
22:42:30.33 |
-30:40:40.2 |
HIP 112101 |
1.86 |
| 2026-04-02 12:00 |
22:42:36.02 |
-30:40:40.1 |
HIP 112106 |
2.89 |
| 2026-04-03 00:00 |
22:42:41.69 |
-30:40:40.4 |
HIP 112106 |
3.95 |
| 2026-04-03 12:00 |
22:42:47.32 |
-30:40:41.0 |
HIP 112106 |
5.08 |
| 2026-04-04 00:00 |
22:42:52.93 |
-30:40:42.1 |
HIP 112106 |
6.24 |
| 2026-04-04 12:00 |
22:42:58.51 |
-30:40:43.5 |
HIP 112106 |
7.41 |
| 2026-04-05 00:00 |
22:43:04.06 |
-30:40:45.3 |
HIP 112106 |
8.58 |
| 2026-04-05 12:00 |
22:43:09.58 |
-30:40:47.5 |
HIP 112106 |
9.75 |
| 2026-04-06 00:00 |
22:43:15.07 |
-30:40:50.1 |
HIP 112106 |
10.92 |
| 2026-04-06 12:00 |
22:43:20.53 |
-30:40:53.0 |
HIP 112106 |
12.08 |
| 2026-04-07 00:00 |
22:43:25.96 |
-30:40:56.4 |
HIP 112106 |
13.25 |
| 2026-04-07 12:00 |
22:43:31.35 |
-30:41:00.1 |
HIP 112106 |
14.40 |
| 2026-04-08 00:00 |
22:43:36.72 |
-30:41:04.3 |
HIP 112106 |
15.56 |
| 2026-04-08 12:00 |
22:43:42.05 |
-30:41:08.8 |
HIP 112106 |
16.70 |
| 2026-04-09 00:00 |
22:43:47.35 |
-30:41:13.7 |
HIP 112106 |
17.84 |
| 2026-04-09 12:00 |
22:43:52.62 |
-30:41:19.1 |
HIP 112106 |
18.98 |
| 2026-04-10 00:00 |
22:43:57.86 |
-30:41:24.8 |
HIP 112106 |
20.11 |
| 2026-04-10 12:00 |
22:44:03.06 |
-30:41:30.9 |
HIP 112106 |
21.23 |
| 2026-04-11 00:00 |
22:44:08.23 |
-30:41:37.4 |
HIP 112106 |
22.35 |
| 2026-04-11 12:00 |
22:44:13.36 |
-30:41:44.3 |
HIP 112106 |
23.46 |
| 2026-04-12 00:00 |
22:44:18.46 |
-30:41:51.6 |
HIP 112106 |
24.56 |
| 2026-04-12 12:00 |
22:44:23.53 |
-30:41:59.3 |
HIP 112106 |
25.66 |
| 2026-04-13 00:00 |
22:44:28.56 |
-30:42:07.4 |
HIP 112270 |
25.66 |
| 2026-04-13 12:00 |
22:44:33.55 |
-30:42:15.9 |
HIP 112270 |
25.54 |
| 2026-04-14 00:00 |
22:44:38.51 |
-30:42:24.8 |
HIP 112270 |
25.46 |
| 2026-04-14 12:00 |
22:44:43.43 |
-30:42:34.2 |
HIP 112270 |
25.42 |
| 2026-04-15 00:00 |
22:44:48.32 |
-30:42:43.9 |
HIP 112270 |
25.42 |
| 2026-04-15 12:00 |
22:44:53.17 |
-30:42:54.0 |
HIP 112270 |
25.45 |
| 2026-04-16 00:00 |
22:44:57.98 |
-30:43:04.5 |
HIP 112270 |
25.51 |