C/1955 L1 (Mrkos)
| 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) |
| 2026-02-03 00:00 |
14:37:23.23 |
-44:43:07.5 |
HIP 71772 |
39.61 |
| 2026-02-03 12:00 |
14:37:23.15 |
-44:43:19.5 |
HIP 71772 |
39.69 |
| 2026-02-04 00:00 |
14:37:23.05 |
-44:43:31.4 |
HIP 71772 |
39.77 |
| 2026-02-04 12:00 |
14:37:22.94 |
-44:43:43.3 |
HIP 71772 |
39.86 |
| 2026-02-05 00:00 |
14:37:22.80 |
-44:43:55.1 |
HIP 71772 |
39.95 |
| 2026-02-05 12:00 |
14:37:22.65 |
-44:44:06.9 |
HIP 71772 |
40.04 |
| 2026-02-06 00:00 |
14:37:22.48 |
-44:44:18.6 |
HIP 71772 |
40.14 |
| 2026-02-06 12:00 |
14:37:22.28 |
-44:44:30.3 |
HIP 71342 |
40.00 |
| 2026-02-07 00:00 |
14:37:22.07 |
-44:44:41.8 |
HIP 71342 |
39.82 |
| 2026-02-07 12:00 |
14:37:21.84 |
-44:44:53.4 |
HIP 71342 |
39.63 |
| 2026-02-08 00:00 |
14:37:21.60 |
-44:45:04.8 |
HIP 71342 |
39.45 |
| 2026-02-08 12:00 |
14:37:21.33 |
-44:45:16.2 |
HIP 71342 |
39.26 |
| 2026-02-09 00:00 |
14:37:21.04 |
-44:45:27.5 |
HIP 71342 |
39.08 |
| 2026-02-09 12:00 |
14:37:20.74 |
-44:45:38.7 |
HIP 71342 |
38.89 |
| 2026-02-10 00:00 |
14:37:20.42 |
-44:45:49.9 |
HIP 71342 |
38.70 |
| 2026-02-10 12:00 |
14:37:20.07 |
-44:46:01.0 |
HIP 71342 |
38.51 |
| 2026-02-11 00:00 |
14:37:19.71 |
-44:46:12.0 |
HIP 71342 |
38.32 |
| 2026-02-11 12:00 |
14:37:19.33 |
-44:46:23.0 |
HIP 71342 |
38.13 |
| 2026-02-12 00:00 |
14:37:18.93 |
-44:46:33.9 |
HIP 71342 |
37.94 |
| 2026-02-12 12:00 |
14:37:18.52 |
-44:46:44.7 |
HIP 71342 |
37.75 |
| 2026-02-13 00:00 |
14:37:18.08 |
-44:46:55.5 |
HIP 71342 |
37.56 |
| 2026-02-13 12:00 |
14:37:17.63 |
-44:47:06.1 |
HIP 71342 |
37.37 |
| 2026-02-14 00:00 |
14:37:17.15 |
-44:47:16.7 |
HIP 71342 |
37.17 |
| 2026-02-14 12:00 |
14:37:16.66 |
-44:47:27.2 |
HIP 71342 |
36.98 |
| 2026-02-15 00:00 |
14:37:16.15 |
-44:47:37.7 |
HIP 71342 |
36.78 |
| 2026-02-15 12:00 |
14:37:15.62 |
-44:47:48.0 |
HIP 71342 |
36.59 |
| 2026-02-16 00:00 |
14:37:15.07 |
-44:47:58.3 |
HIP 71342 |
36.39 |
| 2026-02-16 12:00 |
14:37:14.51 |
-44:48:08.5 |
HIP 71342 |
36.19 |
| 2026-02-17 00:00 |
14:37:13.92 |
-44:48:18.6 |
HIP 71342 |
35.99 |
| 2026-02-17 12:00 |
14:37:13.32 |
-44:48:28.6 |
HIP 71342 |
35.80 |
| 2026-02-18 00:00 |
14:37:12.70 |
-44:48:38.6 |
HIP 71342 |
35.60 |
| 2026-02-18 12:00 |
14:37:12.06 |
-44:48:48.4 |
HIP 71342 |
35.40 |
| 2026-02-19 00:00 |
14:37:11.40 |
-44:48:58.2 |
HIP 71342 |
35.20 |
| 2026-02-19 12:00 |
14:37:10.72 |
-44:49:07.9 |
HIP 71342 |
35.00 |
| 2026-02-20 00:00 |
14:37:10.03 |
-44:49:17.5 |
HIP 71342 |
34.79 |
| 2026-02-20 12:00 |
14:37:09.32 |
-44:49:27.1 |
HIP 71342 |
34.59 |
| 2026-02-21 00:00 |
14:37:08.59 |
-44:49:36.5 |
HIP 71342 |
34.39 |
| 2026-02-21 12:00 |
14:37:07.84 |
-44:49:45.8 |
HIP 71342 |
34.19 |
| 2026-02-22 00:00 |
14:37:07.07 |
-44:49:55.1 |
HIP 71342 |
33.98 |
| 2026-02-22 12:00 |
14:37:06.29 |
-44:50:04.3 |
HIP 71342 |
33.78 |
| 2026-02-23 00:00 |
14:37:05.48 |
-44:50:13.3 |
HIP 71342 |
33.58 |
| 2026-02-23 12:00 |
14:37:04.66 |
-44:50:22.3 |
HIP 71342 |
33.37 |
| 2026-02-24 00:00 |
14:37:03.83 |
-44:50:31.2 |
HIP 71342 |
33.17 |