| Parameter |
Value |
| Designation |
C/1952 H1 (Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1952-06-08T17:20:59.570880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:10Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
37.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1952-07-02.0000000 |
| e |
0.98344799 |
| q (au) |
1.282807 |
| a (au) |
77.501590 |
| i (deg) |
112.034543 |
| Ω (om, deg) |
122.356189 |
| ω (w, deg) |
144.900038 |
| M (ma, deg) |
0.033625 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.294 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.294 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.734 |
| 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) |
| 2026-03-26 00:00 |
08:43:33.22 |
-24:34:38.8 |
HIP 42825 |
3.02 |
| 2026-03-26 12:00 |
08:43:32.37 |
-24:34:24.1 |
HIP 42825 |
2.81 |
| 2026-03-27 00:00 |
08:43:31.53 |
-24:34:09.3 |
HIP 42825 |
2.62 |
| 2026-03-27 12:00 |
08:43:30.70 |
-24:33:54.5 |
HIP 42825 |
2.45 |
| 2026-03-28 00:00 |
08:43:29.88 |
-24:33:39.7 |
HIP 42825 |
2.31 |
| 2026-03-28 12:00 |
08:43:29.07 |
-24:33:24.8 |
HIP 42825 |
2.21 |
| 2026-03-29 00:00 |
08:43:28.27 |
-24:33:09.9 |
HIP 42825 |
2.14 |
| 2026-03-29 12:00 |
08:43:27.49 |
-24:32:55.0 |
HIP 42825 |
2.11 |
| 2026-03-30 00:00 |
08:43:26.71 |
-24:32:40.1 |
HIP 42825 |
2.13 |
| 2026-03-30 12:00 |
08:43:25.95 |
-24:32:25.1 |
HIP 42825 |
2.18 |
| 2026-03-31 00:00 |
08:43:25.20 |
-24:32:10.1 |
HIP 42825 |
2.27 |
| 2026-03-31 12:00 |
08:43:24.46 |
-24:31:55.0 |
HIP 42825 |
2.40 |
| 2026-04-01 00:00 |
08:43:23.73 |
-24:31:40.0 |
HIP 42825 |
2.55 |
| 2026-04-01 12:00 |
08:43:23.01 |
-24:31:24.9 |
HIP 42825 |
2.72 |
| 2026-04-02 00:00 |
08:43:22.31 |
-24:31:09.8 |
HIP 42825 |
2.91 |
| 2026-04-02 12:00 |
08:43:21.62 |
-24:30:54.7 |
HIP 42825 |
3.12 |
| 2026-04-03 00:00 |
08:43:20.93 |
-24:30:39.5 |
HIP 42825 |
3.34 |
| 2026-04-03 12:00 |
08:43:20.27 |
-24:30:24.3 |
HIP 42825 |
3.56 |
| 2026-04-04 00:00 |
08:43:19.61 |
-24:30:09.2 |
HIP 42825 |
3.80 |
| 2026-04-04 12:00 |
08:43:18.96 |
-24:29:53.9 |
HIP 42825 |
4.04 |
| 2026-04-05 00:00 |
08:43:18.33 |
-24:29:38.7 |
HIP 42825 |
4.28 |
| 2026-04-05 12:00 |
08:43:17.71 |
-24:29:23.5 |
HIP 42825 |
4.53 |
| 2026-04-06 00:00 |
08:43:17.10 |
-24:29:08.2 |
HIP 42825 |
4.78 |
| 2026-04-06 12:00 |
08:43:16.50 |
-24:28:53.0 |
HIP 42825 |
5.03 |
| 2026-04-07 00:00 |
08:43:15.91 |
-24:28:37.7 |
HIP 42825 |
5.28 |
| 2026-04-07 12:00 |
08:43:15.34 |
-24:28:22.4 |
HIP 42825 |
5.54 |
| 2026-04-08 00:00 |
08:43:14.78 |
-24:28:07.1 |
HIP 42825 |
5.79 |
| 2026-04-08 12:00 |
08:43:14.23 |
-24:27:51.8 |
HIP 42825 |
6.05 |
| 2026-04-09 00:00 |
08:43:13.69 |
-24:27:36.5 |
HIP 42757 |
5.92 |
| 2026-04-09 12:00 |
08:43:13.17 |
-24:27:21.1 |
HIP 42757 |
5.76 |
| 2026-04-10 00:00 |
08:43:12.65 |
-24:27:05.8 |
HIP 42757 |
5.60 |
| 2026-04-10 12:00 |
08:43:12.15 |
-24:26:50.5 |
HIP 42757 |
5.46 |
| 2026-04-11 00:00 |
08:43:11.67 |
-24:26:35.1 |
HIP 42757 |
5.33 |
| 2026-04-11 12:00 |
08:43:11.19 |
-24:26:19.8 |
HIP 42757 |
5.22 |
| 2026-04-12 00:00 |
08:43:10.73 |
-24:26:04.4 |
HIP 42757 |
5.12 |
| 2026-04-12 12:00 |
08:43:10.28 |
-24:25:49.1 |
HIP 42757 |
5.04 |
| 2026-04-13 00:00 |
08:43:09.84 |
-24:25:33.7 |
HIP 42757 |
4.98 |
| 2026-04-13 12:00 |
08:43:09.41 |
-24:25:18.4 |
HIP 42757 |
4.93 |
| 2026-04-14 00:00 |
08:43:09.00 |
-24:25:03.1 |
HIP 42757 |
4.90 |
| 2026-04-14 12:00 |
08:43:08.60 |
-24:24:47.7 |
HIP 42757 |
4.88 |
| 2026-04-15 00:00 |
08:43:08.21 |
-24:24:32.4 |
HIP 42757 |
4.89 |
| 2026-04-15 12:00 |
08:43:07.84 |
-24:24:17.1 |
HIP 42757 |
4.91 |
| 2026-04-16 00:00 |
08:43:07.47 |
-24:24:01.8 |
HIP 42757 |
4.95 |