| Parameter |
Value |
| Designation |
C/2014 H1 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-04-15T07:54:21.663360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:53Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-05-03.0000000 |
| e |
0.98485086 |
| q (au) |
2.138899 |
| a (au) |
141.189497 |
| i (deg) |
99.935932 |
| Ω (om, deg) |
34.701528 |
| ω (w, deg) |
169.184849 |
| M (ma, deg) |
0.010381 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.467 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.467 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.651 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
03:36:07.41 |
-21:54:44.9 |
HIP 16680 |
25.00 |
| 2026-06-01 12:00 |
03:36:11.50 |
-21:54:40.1 |
HIP 16680 |
25.84 |
| 2026-06-02 00:00 |
03:36:15.58 |
-21:54:35.7 |
HIP 16932 |
25.41 |
| 2026-06-02 12:00 |
03:36:19.65 |
-21:54:31.7 |
HIP 16932 |
24.60 |
| 2026-06-03 00:00 |
03:36:23.71 |
-21:54:28.0 |
HIP 16932 |
23.80 |
| 2026-06-03 12:00 |
03:36:27.76 |
-21:54:24.6 |
HIP 16932 |
23.01 |
| 2026-06-04 00:00 |
03:36:31.80 |
-21:54:21.6 |
HIP 16932 |
22.23 |
| 2026-06-04 12:00 |
03:36:35.83 |
-21:54:19.0 |
HIP 16932 |
21.46 |
| 2026-06-05 00:00 |
03:36:39.85 |
-21:54:16.8 |
HIP 16932 |
20.70 |
| 2026-06-05 12:00 |
03:36:43.86 |
-21:54:14.9 |
HIP 16932 |
19.96 |
| 2026-06-06 00:00 |
03:36:47.86 |
-21:54:13.3 |
HIP 16932 |
19.23 |
| 2026-06-06 12:00 |
03:36:51.84 |
-21:54:12.1 |
HIP 16932 |
18.52 |
| 2026-06-07 00:00 |
03:36:55.82 |
-21:54:11.3 |
HIP 16932 |
17.83 |
| 2026-06-07 12:00 |
03:36:59.78 |
-21:54:10.8 |
HIP 16932 |
17.15 |
| 2026-06-08 00:00 |
03:37:03.73 |
-21:54:10.7 |
HIP 16932 |
16.50 |
| 2026-06-08 12:00 |
03:37:07.67 |
-21:54:10.9 |
HIP 16932 |
15.87 |
| 2026-06-09 00:00 |
03:37:11.60 |
-21:54:11.5 |
HIP 16932 |
15.26 |
| 2026-06-09 12:00 |
03:37:15.51 |
-21:54:12.4 |
HIP 16932 |
14.68 |
| 2026-06-10 00:00 |
03:37:19.41 |
-21:54:13.7 |
HIP 16932 |
14.14 |
| 2026-06-10 12:00 |
03:37:23.29 |
-21:54:15.4 |
HIP 16932 |
13.63 |
| 2026-06-11 00:00 |
03:37:27.17 |
-21:54:17.4 |
HIP 16932 |
13.16 |
| 2026-06-11 12:00 |
03:37:31.03 |
-21:54:19.8 |
HIP 16932 |
12.73 |
| 2026-06-12 00:00 |
03:37:34.87 |
-21:54:22.5 |
HIP 16932 |
12.35 |
| 2026-06-12 12:00 |
03:37:38.70 |
-21:54:25.6 |
HIP 16932 |
12.01 |
| 2026-06-13 00:00 |
03:37:42.51 |
-21:54:29.1 |
HIP 16932 |
11.73 |
| 2026-06-13 12:00 |
03:37:46.31 |
-21:54:32.9 |
HIP 16932 |
11.50 |
| 2026-06-14 00:00 |
03:37:50.10 |
-21:54:37.0 |
HIP 16932 |
11.34 |
| 2026-06-14 12:00 |
03:37:53.87 |
-21:54:41.5 |
HIP 16932 |
11.23 |
| 2026-06-15 00:00 |
03:37:57.62 |
-21:54:46.4 |
HIP 16932 |
11.19 |
| 2026-06-15 12:00 |
03:38:01.35 |
-21:54:51.6 |
HIP 16932 |
11.20 |
| 2026-06-16 00:00 |
03:38:05.07 |
-21:54:57.2 |
HIP 16932 |
11.28 |
| 2026-06-16 12:00 |
03:38:08.77 |
-21:55:03.1 |
HIP 16932 |
11.42 |
| 2026-06-17 00:00 |
03:38:12.46 |
-21:55:09.4 |
HIP 16932 |
11.61 |
| 2026-06-17 12:00 |
03:38:16.13 |
-21:55:16.0 |
HIP 16932 |
11.86 |
| 2026-06-18 00:00 |
03:38:19.78 |
-21:55:23.0 |
HIP 16932 |
12.15 |
| 2026-06-18 12:00 |
03:38:23.41 |
-21:55:30.3 |
HIP 16932 |
12.49 |
| 2026-06-19 00:00 |
03:38:27.02 |
-21:55:38.0 |
HIP 16932 |
12.86 |
| 2026-06-19 12:00 |
03:38:30.62 |
-21:55:46.1 |
HIP 16932 |
13.28 |
| 2026-06-20 00:00 |
03:38:34.19 |
-21:55:54.4 |
HIP 16932 |
13.72 |
| 2026-06-20 12:00 |
03:38:37.75 |
-21:56:03.2 |
HIP 16932 |
14.20 |
| 2026-06-21 00:00 |
03:38:41.29 |
-21:56:12.2 |
HIP 16932 |
14.70 |
| 2026-06-21 12:00 |
03:38:44.81 |
-21:56:21.6 |
HIP 16932 |
15.22 |
| 2026-06-22 00:00 |
03:38:48.31 |
-21:56:31.4 |
HIP 16932 |
15.76 |