| Parameter |
Value |
| Designation |
C/1955 L1 (Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1955-06-04T03:57:09.207360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
21 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1955-07-14.0000000 |
| e |
0.98921350 |
| q (au) |
0.534369 |
| a (au) |
49.540478 |
| i (deg) |
86.503010 |
| Ω (om, deg) |
48.941547 |
| ω (w, deg) |
32.506239 |
| M (ma, deg) |
0.112598 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.847 + 4.080\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.847 |
| n |
4.080 |
| gf |
1.000 |
| gb |
-0.565 |
| 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) |
| 2026-05-12 00:00 |
14:32:32.10 |
-44:51:29.6 |
HIP 71046 |
8.56 |
| 2026-05-12 12:00 |
14:32:29.98 |
-44:51:21.4 |
HIP 71046 |
8.16 |
| 2026-05-13 00:00 |
14:32:27.86 |
-44:51:13.2 |
HIP 71046 |
7.76 |
| 2026-05-13 12:00 |
14:32:25.75 |
-44:51:04.9 |
HIP 71046 |
7.36 |
| 2026-05-14 00:00 |
14:32:23.64 |
-44:50:56.4 |
HIP 71046 |
6.96 |
| 2026-05-14 12:00 |
14:32:21.53 |
-44:50:47.9 |
HIP 71046 |
6.57 |
| 2026-05-15 00:00 |
14:32:19.43 |
-44:50:39.3 |
HIP 71046 |
6.17 |
| 2026-05-15 12:00 |
14:32:17.33 |
-44:50:30.6 |
HIP 71046 |
5.77 |
| 2026-05-16 00:00 |
14:32:15.24 |
-44:50:21.8 |
HIP 71046 |
5.37 |
| 2026-05-16 12:00 |
14:32:13.15 |
-44:50:12.9 |
HIP 71046 |
4.97 |
| 2026-05-17 00:00 |
14:32:11.07 |
-44:50:04.0 |
HIP 71046 |
4.57 |
| 2026-05-17 12:00 |
14:32:08.99 |
-44:49:54.9 |
HIP 71046 |
4.17 |
| 2026-05-18 00:00 |
14:32:06.92 |
-44:49:45.8 |
HIP 71046 |
3.78 |
| 2026-05-18 12:00 |
14:32:04.85 |
-44:49:36.6 |
HIP 71046 |
3.38 |
| 2026-05-19 00:00 |
14:32:02.79 |
-44:49:27.3 |
HIP 71046 |
2.98 |
| 2026-05-19 12:00 |
14:32:00.73 |
-44:49:17.9 |
HIP 71046 |
2.59 |
| 2026-05-20 00:00 |
14:31:58.68 |
-44:49:08.4 |
HIP 71046 |
2.19 |
| 2026-05-20 12:00 |
14:31:56.64 |
-44:48:58.9 |
HIP 71046 |
1.80 |
| 2026-05-21 00:00 |
14:31:54.60 |
-44:48:49.3 |
HIP 71046 |
1.40 |
| 2026-05-21 12:00 |
14:31:52.57 |
-44:48:39.6 |
HIP 71046 |
1.01 |
| 2026-05-22 00:00 |
14:31:50.55 |
-44:48:29.8 |
HIP 71046 |
0.63 |
| 2026-05-22 12:00 |
14:31:48.53 |
-44:48:19.9 |
HIP 71046 |
0.27 |
| 2026-05-23 00:00 |
14:31:46.52 |
-44:48:10.0 |
HIP 71046 |
0.25 |
| 2026-05-23 12:00 |
14:31:44.51 |
-44:48:00.0 |
HIP 71046 |
0.60 |
| 2026-05-24 00:00 |
14:31:42.51 |
-44:47:49.9 |
HIP 71046 |
0.99 |
| 2026-05-24 12:00 |
14:31:40.52 |
-44:47:39.7 |
HIP 71046 |
1.37 |
| 2026-05-25 00:00 |
14:31:38.54 |
-44:47:29.5 |
HIP 71046 |
1.76 |
| 2026-05-25 12:00 |
14:31:36.57 |
-44:47:19.2 |
HIP 71046 |
2.15 |
| 2026-05-26 00:00 |
14:31:34.60 |
-44:47:08.8 |
HIP 71023 |
2.13 |
| 2026-05-26 12:00 |
14:31:32.64 |
-44:46:58.4 |
HIP 71023 |
1.95 |
| 2026-05-27 00:00 |
14:31:30.69 |
-44:46:47.9 |
HIP 71023 |
1.83 |
| 2026-05-27 12:00 |
14:31:28.74 |
-44:46:37.3 |
HIP 71023 |
1.79 |
| 2026-05-28 00:00 |
14:31:26.81 |
-44:46:26.6 |
HIP 71023 |
1.84 |
| 2026-05-28 12:00 |
14:31:24.88 |
-44:46:15.9 |
HIP 71023 |
1.95 |
| 2026-05-29 00:00 |
14:31:22.96 |
-44:46:05.1 |
HIP 71023 |
2.13 |
| 2026-05-29 12:00 |
14:31:21.05 |
-44:45:54.3 |
HIP 71023 |
2.36 |
| 2026-05-30 00:00 |
14:31:19.15 |
-44:45:43.3 |
HIP 71023 |
2.63 |
| 2026-05-30 12:00 |
14:31:17.26 |
-44:45:32.4 |
HIP 71023 |
2.91 |
| 2026-05-31 00:00 |
14:31:15.37 |
-44:45:21.3 |
HIP 71023 |
3.22 |
| 2026-05-31 12:00 |
14:31:13.50 |
-44:45:10.2 |
HIP 71023 |
3.54 |
| 2026-06-01 00:00 |
14:31:11.63 |
-44:44:59.0 |
HIP 71023 |
3.87 |
| 2026-06-01 12:00 |
14:31:09.78 |
-44:44:47.8 |
HIP 71023 |
4.20 |
| 2026-06-02 00:00 |
14:31:07.93 |
-44:44:36.5 |
HIP 71023 |
4.54 |