C/1959 X1 (Mrkos)
| Parameter |
Value |
| Designation |
C/1959 X1 (Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1959-11-13T05:29:53.125440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
19 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1960-05-18.0000000 |
| e |
0.99998877 |
| q (au) |
1.253241 |
| a (au) |
111604.932920 |
| i (deg) |
19.636163 |
| Ω (om, deg) |
100.618812 |
| ω (w, deg) |
84.688954 |
| M (ma, deg) |
0.000005 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.553 + 3.942\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.553 |
| n |
3.942 |
| gf |
0.995 |
| gb |
-0.680 |
| k |
0.811 |
| 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 |
23:55:08.34 |
-20:34:51.6 |
HIP 117989 |
13.51 |
| 2026-02-03 12:00 |
23:55:09.29 |
-20:34:41.3 |
HIP 117989 |
13.23 |
| 2026-02-04 00:00 |
23:55:10.25 |
-20:34:31.0 |
HIP 117989 |
12.95 |
| 2026-02-04 12:00 |
23:55:11.22 |
-20:34:20.7 |
HIP 117989 |
12.67 |
| 2026-02-05 00:00 |
23:55:12.20 |
-20:34:10.3 |
HIP 117989 |
12.38 |
| 2026-02-05 12:00 |
23:55:13.18 |
-20:34:00.0 |
HIP 117989 |
12.10 |
| 2026-02-06 00:00 |
23:55:14.17 |
-20:33:49.7 |
HIP 117989 |
11.81 |
| 2026-02-06 12:00 |
23:55:15.17 |
-20:33:39.4 |
HIP 117989 |
11.52 |
| 2026-02-07 00:00 |
23:55:16.18 |
-20:33:29.1 |
HIP 117989 |
11.24 |
| 2026-02-07 12:00 |
23:55:17.19 |
-20:33:18.8 |
HIP 117989 |
10.94 |
| 2026-02-08 00:00 |
23:55:18.21 |
-20:33:08.6 |
HIP 117989 |
10.65 |
| 2026-02-08 12:00 |
23:55:19.24 |
-20:32:58.3 |
HIP 117989 |
10.36 |
| 2026-02-09 00:00 |
23:55:20.28 |
-20:32:48.0 |
HIP 117989 |
10.06 |
| 2026-02-09 12:00 |
23:55:21.32 |
-20:32:37.7 |
HIP 117989 |
9.77 |
| 2026-02-10 00:00 |
23:55:22.37 |
-20:32:27.4 |
HIP 117989 |
9.47 |
| 2026-02-10 12:00 |
23:55:23.42 |
-20:32:17.2 |
HIP 117989 |
9.17 |
| 2026-02-11 00:00 |
23:55:24.49 |
-20:32:06.9 |
HIP 117989 |
8.87 |
| 2026-02-11 12:00 |
23:55:25.56 |
-20:31:56.7 |
HIP 117989 |
8.57 |
| 2026-02-12 00:00 |
23:55:26.63 |
-20:31:46.5 |
HIP 117989 |
8.27 |
| 2026-02-12 12:00 |
23:55:27.72 |
-20:31:36.2 |
HIP 117989 |
7.96 |
| 2026-02-13 00:00 |
23:55:28.81 |
-20:31:26.0 |
HIP 117989 |
7.66 |
| 2026-02-13 12:00 |
23:55:29.90 |
-20:31:15.8 |
HIP 117989 |
7.35 |
| 2026-02-14 00:00 |
23:55:31.00 |
-20:31:05.6 |
HIP 117989 |
7.05 |
| 2026-02-14 12:00 |
23:55:32.11 |
-20:30:55.5 |
HIP 117989 |
6.74 |
| 2026-02-15 00:00 |
23:55:33.23 |
-20:30:45.3 |
HIP 117989 |
6.43 |
| 2026-02-15 12:00 |
23:55:34.35 |
-20:30:35.2 |
HIP 117989 |
6.12 |
| 2026-02-16 00:00 |
23:55:35.47 |
-20:30:25.0 |
HIP 117989 |
5.81 |
| 2026-02-16 12:00 |
23:55:36.61 |
-20:30:14.9 |
HIP 117989 |
5.50 |
| 2026-02-17 00:00 |
23:55:37.75 |
-20:30:04.8 |
HIP 117989 |
5.19 |
| 2026-02-17 12:00 |
23:55:38.89 |
-20:29:54.8 |
HIP 117989 |
4.88 |
| 2026-02-18 00:00 |
23:55:40.04 |
-20:29:44.7 |
HIP 117989 |
4.56 |
| 2026-02-18 12:00 |
23:55:41.20 |
-20:29:34.7 |
HIP 117989 |
4.25 |
| 2026-02-19 00:00 |
23:55:42.36 |
-20:29:24.6 |
HIP 117989 |
3.93 |
| 2026-02-19 12:00 |
23:55:43.52 |
-20:29:14.7 |
HIP 117989 |
3.62 |
| 2026-02-20 00:00 |
23:55:44.69 |
-20:29:04.7 |
HIP 117989 |
3.30 |
| 2026-02-20 12:00 |
23:55:45.87 |
-20:28:54.7 |
HIP 117989 |
2.99 |
| 2026-02-21 00:00 |
23:55:47.05 |
-20:28:44.8 |
HIP 117989 |
2.68 |
| 2026-02-21 12:00 |
23:55:48.24 |
-20:28:34.9 |
HIP 117989 |
2.36 |
| 2026-02-22 00:00 |
23:55:49.43 |
-20:28:25.0 |
HIP 117989 |
2.05 |
| 2026-02-22 12:00 |
23:55:50.63 |
-20:28:15.2 |
HIP 117989 |
1.75 |
| 2026-02-23 00:00 |
23:55:51.83 |
-20:28:05.4 |
HIP 117989 |
1.45 |
| 2026-02-23 12:00 |
23:55:53.03 |
-20:27:55.6 |
HIP 117989 |
1.16 |
| 2026-02-24 00:00 |
23:55:54.24 |
-20:27:45.8 |
HIP 117989 |
0.90 |