| Parameter |
Value |
| Designation |
C/2014 M2 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-12T15:05:12.776640Z |
| Orbit solution date (soln_date, UTC) |
2022-06-28T07:55:51Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-19.0000000 |
| e |
0.99274520 |
| q (au) |
6.909654 |
| a (au) |
952.425613 |
| i (deg) |
32.418761 |
| Ω (om, deg) |
245.346855 |
| ω (w, deg) |
40.275887 |
| M (ma, deg) |
0.000214 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.640 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.640 |
| n |
2.000 |
| gf |
0.987 |
| gb |
-0.586 |
| k |
0.800 |
| δ90 |
9.139 |
| 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) |
| 2026-06-01 00:00 |
02:37:00.09 |
+28:08:36.5 |
HIP 12255 |
15.66 |
| 2026-06-01 12:00 |
02:37:05.29 |
+28:09:00.1 |
HIP 12255 |
14.60 |
| 2026-06-02 00:00 |
02:37:10.47 |
+28:09:23.7 |
HIP 12255 |
13.58 |
| 2026-06-02 12:00 |
02:37:15.64 |
+28:09:47.3 |
HIP 12255 |
12.58 |
| 2026-06-03 00:00 |
02:37:20.79 |
+28:10:10.9 |
HIP 12255 |
11.63 |
| 2026-06-03 12:00 |
02:37:25.91 |
+28:10:34.5 |
HIP 12255 |
10.74 |
| 2026-06-04 00:00 |
02:37:31.02 |
+28:10:58.2 |
HIP 12255 |
9.90 |
| 2026-06-04 12:00 |
02:37:36.10 |
+28:11:21.8 |
HIP 12255 |
9.15 |
| 2026-06-05 00:00 |
02:37:41.16 |
+28:11:45.5 |
HIP 12255 |
8.50 |
| 2026-06-05 12:00 |
02:37:46.21 |
+28:12:09.2 |
HIP 12255 |
7.97 |
| 2026-06-06 00:00 |
02:37:51.23 |
+28:12:32.9 |
HIP 12255 |
7.59 |
| 2026-06-06 12:00 |
02:37:56.23 |
+28:12:56.6 |
HIP 12255 |
7.38 |
| 2026-06-07 00:00 |
02:38:01.21 |
+28:13:20.3 |
HIP 12255 |
7.34 |
| 2026-06-07 12:00 |
02:38:06.16 |
+28:13:44.0 |
HIP 12255 |
7.49 |
| 2026-06-08 00:00 |
02:38:11.09 |
+28:14:07.7 |
HIP 12255 |
7.81 |
| 2026-06-08 12:00 |
02:38:16.00 |
+28:14:31.4 |
HIP 12255 |
8.27 |
| 2026-06-09 00:00 |
02:38:20.89 |
+28:14:55.1 |
HIP 12255 |
8.85 |
| 2026-06-09 12:00 |
02:38:25.76 |
+28:15:18.8 |
HIP 12255 |
9.54 |
| 2026-06-10 00:00 |
02:38:30.60 |
+28:15:42.5 |
HIP 12255 |
10.30 |
| 2026-06-10 12:00 |
02:38:35.41 |
+28:16:06.2 |
HIP 12255 |
11.12 |
| 2026-06-11 00:00 |
02:38:40.21 |
+28:16:29.9 |
HIP 12255 |
11.98 |
| 2026-06-11 12:00 |
02:38:44.97 |
+28:16:53.6 |
HIP 12255 |
12.88 |
| 2026-06-12 00:00 |
02:38:49.72 |
+28:17:17.2 |
HIP 12255 |
13.81 |
| 2026-06-12 12:00 |
02:38:54.44 |
+28:17:40.9 |
HIP 12255 |
14.75 |
| 2026-06-13 00:00 |
02:38:59.13 |
+28:18:04.5 |
HIP 12255 |
15.72 |
| 2026-06-13 12:00 |
02:39:03.80 |
+28:18:28.1 |
HIP 12255 |
16.69 |
| 2026-06-14 00:00 |
02:39:08.44 |
+28:18:51.8 |
HIP 12255 |
17.68 |
| 2026-06-14 12:00 |
02:39:13.05 |
+28:19:15.3 |
HIP 12255 |
18.67 |
| 2026-06-15 00:00 |
02:39:17.64 |
+28:19:38.9 |
HIP 12255 |
19.66 |
| 2026-06-15 12:00 |
02:39:22.20 |
+28:20:02.5 |
HIP 12255 |
20.66 |
| 2026-06-16 00:00 |
02:39:26.74 |
+28:20:26.0 |
HIP 12255 |
21.66 |
| 2026-06-16 12:00 |
02:39:31.25 |
+28:20:49.5 |
HIP 12255 |
22.66 |
| 2026-06-17 00:00 |
02:39:35.73 |
+28:21:12.9 |
HIP 12255 |
23.66 |
| 2026-06-17 12:00 |
02:39:40.18 |
+28:21:36.4 |
HIP 12255 |
24.66 |
| 2026-06-18 00:00 |
02:39:44.61 |
+28:21:59.8 |
HIP 12255 |
25.66 |
| 2026-06-18 12:00 |
02:39:49.00 |
+28:22:23.2 |
HIP 12255 |
26.65 |
| 2026-06-19 00:00 |
02:39:53.37 |
+28:22:46.5 |
HIP 12295 |
27.13 |
| 2026-06-19 12:00 |
02:39:57.71 |
+28:23:09.8 |
HIP 12295 |
27.60 |
| 2026-06-20 00:00 |
02:40:02.02 |
+28:23:33.1 |
HIP 12295 |
28.09 |
| 2026-06-20 12:00 |
02:40:06.30 |
+28:23:56.3 |
HIP 12295 |
28.60 |
| 2026-06-21 00:00 |
02:40:10.55 |
+28:24:19.5 |
HIP 12295 |
29.13 |
| 2026-06-21 12:00 |
02:40:14.78 |
+28:24:42.7 |
HIP 12295 |
29.68 |
| 2026-06-22 00:00 |
02:40:18.97 |
+28:25:05.8 |
HIP 12295 |
30.26 |