C/1956 E1 (Mrkos)
| Parameter |
Value |
| Designation |
C/1956 E1 (Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1956-04-13T14:37:14.880000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
4 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1956-04-05.0000000 |
| e |
1.00000000 |
| q (au) |
0.842240 |
| a (au) |
- |
| i (deg) |
147.451900 |
| Ω (om, deg) |
226.715900 |
| ω (w, deg) |
81.001500 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (9.975 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.975 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.938 |
| 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 |
23:38:28.88 |
-35:29:20.8 |
HIP 116513 |
23.85 |
| 2026-02-03 12:00 |
23:38:29.94 |
-35:29:09.5 |
HIP 116513 |
24.00 |
| 2026-02-04 00:00 |
23:38:31.02 |
-35:28:58.2 |
HIP 116513 |
24.14 |
| 2026-02-04 12:00 |
23:38:32.10 |
-35:28:47.0 |
HIP 116513 |
24.29 |
| 2026-02-05 00:00 |
23:38:33.19 |
-35:28:35.8 |
HIP 116513 |
24.45 |
| 2026-02-05 12:00 |
23:38:34.28 |
-35:28:24.6 |
HIP 116513 |
24.61 |
| 2026-02-06 00:00 |
23:38:35.38 |
-35:28:13.4 |
HIP 116513 |
24.77 |
| 2026-02-06 12:00 |
23:38:36.50 |
-35:28:02.3 |
HIP 116513 |
24.94 |
| 2026-02-07 00:00 |
23:38:37.61 |
-35:27:51.3 |
HIP 116513 |
25.11 |
| 2026-02-07 12:00 |
23:38:38.74 |
-35:27:40.2 |
HIP 116513 |
25.28 |
| 2026-02-08 00:00 |
23:38:39.87 |
-35:27:29.2 |
HIP 116513 |
25.46 |
| 2026-02-08 12:00 |
23:38:41.01 |
-35:27:18.3 |
HIP 116513 |
25.64 |
| 2026-02-09 00:00 |
23:38:42.16 |
-35:27:07.4 |
HIP 116513 |
25.83 |
| 2026-02-09 12:00 |
23:38:43.31 |
-35:26:56.5 |
HIP 116513 |
26.02 |
| 2026-02-10 00:00 |
23:38:44.47 |
-35:26:45.7 |
HIP 116513 |
26.21 |
| 2026-02-10 12:00 |
23:38:45.64 |
-35:26:35.0 |
HIP 116513 |
26.41 |
| 2026-02-11 00:00 |
23:38:46.81 |
-35:26:24.2 |
HIP 116513 |
26.61 |
| 2026-02-11 12:00 |
23:38:47.99 |
-35:26:13.6 |
HIP 116513 |
26.81 |
| 2026-02-12 00:00 |
23:38:49.17 |
-35:26:02.9 |
HIP 116513 |
27.02 |
| 2026-02-12 12:00 |
23:38:50.37 |
-35:25:52.4 |
HIP 116513 |
27.23 |
| 2026-02-13 00:00 |
23:38:51.57 |
-35:25:41.8 |
HIP 116513 |
27.44 |
| 2026-02-13 12:00 |
23:38:52.77 |
-35:25:31.3 |
HIP 116513 |
27.66 |
| 2026-02-14 00:00 |
23:38:53.98 |
-35:25:20.9 |
HIP 116513 |
27.87 |
| 2026-02-14 12:00 |
23:38:55.20 |
-35:25:10.5 |
HIP 116513 |
28.10 |
| 2026-02-15 00:00 |
23:38:56.42 |
-35:25:00.2 |
HIP 116513 |
28.32 |
| 2026-02-15 12:00 |
23:38:57.65 |
-35:24:49.9 |
HIP 116513 |
28.55 |
| 2026-02-16 00:00 |
23:38:58.88 |
-35:24:39.7 |
HIP 116513 |
28.78 |
| 2026-02-16 12:00 |
23:39:00.12 |
-35:24:29.5 |
HIP 116513 |
29.01 |
| 2026-02-17 00:00 |
23:39:01.37 |
-35:24:19.4 |
HIP 116513 |
29.24 |
| 2026-02-17 12:00 |
23:39:02.62 |
-35:24:09.4 |
HIP 116513 |
29.48 |
| 2026-02-18 00:00 |
23:39:03.87 |
-35:23:59.4 |
HIP 116711 |
29.53 |
| 2026-02-18 12:00 |
23:39:05.13 |
-35:23:49.4 |
HIP 116711 |
29.35 |
| 2026-02-19 00:00 |
23:39:06.40 |
-35:23:39.6 |
HIP 116711 |
29.18 |
| 2026-02-19 12:00 |
23:39:07.67 |
-35:23:29.7 |
HIP 116711 |
29.01 |
| 2026-02-20 00:00 |
23:39:08.94 |
-35:23:20.0 |
HIP 116711 |
28.85 |
| 2026-02-20 12:00 |
23:39:10.22 |
-35:23:10.3 |
HIP 116711 |
28.69 |
| 2026-02-21 00:00 |
23:39:11.51 |
-35:23:00.6 |
HIP 116711 |
28.53 |
| 2026-02-21 12:00 |
23:39:12.80 |
-35:22:51.1 |
HIP 116711 |
28.38 |
| 2026-02-22 00:00 |
23:39:14.09 |
-35:22:41.5 |
HIP 116711 |
28.23 |
| 2026-02-22 12:00 |
23:39:15.39 |
-35:22:32.1 |
HIP 116711 |
28.08 |
| 2026-02-23 00:00 |
23:39:16.69 |
-35:22:22.7 |
HIP 116711 |
27.94 |
| 2026-02-23 12:00 |
23:39:18.00 |
-35:22:13.4 |
HIP 116711 |
27.80 |
| 2026-02-24 00:00 |
23:39:19.31 |
-35:22:04.1 |
HIP 116711 |
27.66 |