| 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) |
| 2026-06-01 00:00 |
23:42:50.74 |
-35:20:16.0 |
HIP 116903 |
14.97 |
| 2026-06-01 12:00 |
23:42:51.09 |
-35:20:24.3 |
HIP 116903 |
15.10 |
| 2026-06-02 00:00 |
23:42:51.43 |
-35:20:32.8 |
HIP 116903 |
15.23 |
| 2026-06-02 12:00 |
23:42:51.76 |
-35:20:41.3 |
HIP 116903 |
15.36 |
| 2026-06-03 00:00 |
23:42:52.07 |
-35:20:49.9 |
HIP 116903 |
15.49 |
| 2026-06-03 12:00 |
23:42:52.38 |
-35:20:58.6 |
HIP 116903 |
15.61 |
| 2026-06-04 00:00 |
23:42:52.67 |
-35:21:07.4 |
HIP 116903 |
15.74 |
| 2026-06-04 12:00 |
23:42:52.96 |
-35:21:16.2 |
HIP 116903 |
15.87 |
| 2026-06-05 00:00 |
23:42:53.23 |
-35:21:25.1 |
HIP 116903 |
15.99 |
| 2026-06-05 12:00 |
23:42:53.49 |
-35:21:34.0 |
HIP 116903 |
16.11 |
| 2026-06-06 00:00 |
23:42:53.74 |
-35:21:43.0 |
HIP 116903 |
16.24 |
| 2026-06-06 12:00 |
23:42:53.97 |
-35:21:52.1 |
HIP 116903 |
16.36 |
| 2026-06-07 00:00 |
23:42:54.20 |
-35:22:01.3 |
HIP 116903 |
16.48 |
| 2026-06-07 12:00 |
23:42:54.41 |
-35:22:10.5 |
HIP 116903 |
16.60 |
| 2026-06-08 00:00 |
23:42:54.61 |
-35:22:19.8 |
HIP 116903 |
16.72 |
| 2026-06-08 12:00 |
23:42:54.81 |
-35:22:29.1 |
HIP 116903 |
16.84 |
| 2026-06-09 00:00 |
23:42:54.98 |
-35:22:38.6 |
HIP 116903 |
16.96 |
| 2026-06-09 12:00 |
23:42:55.15 |
-35:22:48.1 |
HIP 116903 |
17.08 |
| 2026-06-10 00:00 |
23:42:55.31 |
-35:22:57.6 |
HIP 116903 |
17.19 |
| 2026-06-10 12:00 |
23:42:55.45 |
-35:23:07.2 |
HIP 116903 |
17.31 |
| 2026-06-11 00:00 |
23:42:55.59 |
-35:23:16.9 |
HIP 116903 |
17.43 |
| 2026-06-11 12:00 |
23:42:55.71 |
-35:23:26.6 |
HIP 116903 |
17.54 |
| 2026-06-12 00:00 |
23:42:55.82 |
-35:23:36.4 |
HIP 116903 |
17.66 |
| 2026-06-12 12:00 |
23:42:55.91 |
-35:23:46.3 |
HIP 116903 |
17.77 |
| 2026-06-13 00:00 |
23:42:56.00 |
-35:23:56.2 |
HIP 116903 |
17.89 |
| 2026-06-13 12:00 |
23:42:56.07 |
-35:24:06.2 |
HIP 116903 |
18.00 |
| 2026-06-14 00:00 |
23:42:56.13 |
-35:24:16.2 |
HIP 116903 |
18.11 |
| 2026-06-14 12:00 |
23:42:56.19 |
-35:24:26.3 |
HIP 116903 |
18.22 |
| 2026-06-15 00:00 |
23:42:56.22 |
-35:24:36.5 |
HIP 116903 |
18.34 |
| 2026-06-15 12:00 |
23:42:56.25 |
-35:24:46.7 |
HIP 116903 |
18.45 |
| 2026-06-16 00:00 |
23:42:56.26 |
-35:24:56.9 |
HIP 116903 |
18.56 |
| 2026-06-16 12:00 |
23:42:56.27 |
-35:25:07.2 |
HIP 116903 |
18.67 |
| 2026-06-17 00:00 |
23:42:56.26 |
-35:25:17.6 |
HIP 116903 |
18.78 |
| 2026-06-17 12:00 |
23:42:56.24 |
-35:25:28.0 |
HIP 116903 |
18.89 |
| 2026-06-18 00:00 |
23:42:56.21 |
-35:25:38.5 |
HIP 116903 |
19.00 |
| 2026-06-18 12:00 |
23:42:56.16 |
-35:25:49.0 |
HIP 116903 |
19.11 |
| 2026-06-19 00:00 |
23:42:56.11 |
-35:25:59.6 |
HIP 116903 |
19.22 |
| 2026-06-19 12:00 |
23:42:56.04 |
-35:26:10.2 |
HIP 116903 |
19.33 |
| 2026-06-20 00:00 |
23:42:55.96 |
-35:26:20.9 |
HIP 116903 |
19.44 |
| 2026-06-20 12:00 |
23:42:55.87 |
-35:26:31.6 |
HIP 116903 |
19.55 |
| 2026-06-21 00:00 |
23:42:55.76 |
-35:26:42.4 |
HIP 116903 |
19.66 |
| 2026-06-21 12:00 |
23:42:55.65 |
-35:26:53.2 |
HIP 116903 |
19.77 |
| 2026-06-22 00:00 |
23:42:55.52 |
-35:27:04.1 |
HIP 116903 |
19.88 |