| Parameter |
Value |
| Designation |
C/1953 G1 (Mrkos-Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1953-05-26T10:29:28.317120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1953-07-09.0000000 |
| e |
0.99746509 |
| q (au) |
1.022127 |
| a (au) |
403.221047 |
| i (deg) |
93.856976 |
| Ω (om, deg) |
275.885480 |
| ω (w, deg) |
85.742269 |
| M (ma, deg) |
0.005303 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.774 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.774 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.544 |
| k |
0.800 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1953-04-14 |
1953-05-25 |
+53.5483 |
-1.301 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
05:45:05.90 |
-50:06:29.5 |
HIP 27140 |
6.25 |
| 2026-06-01 12:00 |
05:45:07.74 |
-50:06:24.6 |
HIP 27140 |
6.27 |
| 2026-06-02 00:00 |
05:45:09.59 |
-50:06:19.8 |
HIP 27140 |
6.29 |
| 2026-06-02 12:00 |
05:45:11.44 |
-50:06:15.2 |
HIP 27140 |
6.33 |
| 2026-06-03 00:00 |
05:45:13.29 |
-50:06:10.7 |
HIP 27140 |
6.38 |
| 2026-06-03 12:00 |
05:45:15.14 |
-50:06:06.3 |
HIP 27140 |
6.45 |
| 2026-06-04 00:00 |
05:45:17.00 |
-50:06:02.1 |
HIP 27140 |
6.52 |
| 2026-06-04 12:00 |
05:45:18.87 |
-50:05:58.1 |
HIP 27140 |
6.61 |
| 2026-06-05 00:00 |
05:45:20.74 |
-50:05:54.1 |
HIP 27140 |
6.70 |
| 2026-06-05 12:00 |
05:45:22.61 |
-50:05:50.4 |
HIP 27140 |
6.81 |
| 2026-06-06 00:00 |
05:45:24.48 |
-50:05:46.7 |
HIP 27140 |
6.92 |
| 2026-06-06 12:00 |
05:45:26.36 |
-50:05:43.2 |
HIP 27140 |
7.05 |
| 2026-06-07 00:00 |
05:45:28.24 |
-50:05:39.9 |
HIP 27140 |
7.18 |
| 2026-06-07 12:00 |
05:45:30.12 |
-50:05:36.7 |
HIP 27140 |
7.33 |
| 2026-06-08 00:00 |
05:45:32.01 |
-50:05:33.6 |
HIP 27140 |
7.48 |
| 2026-06-08 12:00 |
05:45:33.90 |
-50:05:30.7 |
HIP 27140 |
7.63 |
| 2026-06-09 00:00 |
05:45:35.79 |
-50:05:28.0 |
HIP 27140 |
7.80 |
| 2026-06-09 12:00 |
05:45:37.69 |
-50:05:25.3 |
HIP 27140 |
7.97 |
| 2026-06-10 00:00 |
05:45:39.58 |
-50:05:22.9 |
HIP 27140 |
8.14 |
| 2026-06-10 12:00 |
05:45:41.48 |
-50:05:20.6 |
HIP 27140 |
8.33 |
| 2026-06-11 00:00 |
05:45:43.38 |
-50:05:18.4 |
HIP 27140 |
8.51 |
| 2026-06-11 12:00 |
05:45:45.29 |
-50:05:16.4 |
HIP 27140 |
8.70 |
| 2026-06-12 00:00 |
05:45:47.19 |
-50:05:14.5 |
HIP 27140 |
8.90 |
| 2026-06-12 12:00 |
05:45:49.10 |
-50:05:12.7 |
HIP 27140 |
9.10 |
| 2026-06-13 00:00 |
05:45:51.01 |
-50:05:11.2 |
HIP 27140 |
9.31 |
| 2026-06-13 12:00 |
05:45:52.92 |
-50:05:09.7 |
HIP 27140 |
9.52 |
| 2026-06-14 00:00 |
05:45:54.83 |
-50:05:08.4 |
HIP 27140 |
9.73 |
| 2026-06-14 12:00 |
05:45:56.74 |
-50:05:07.3 |
HIP 27140 |
9.94 |
| 2026-06-15 00:00 |
05:45:58.65 |
-50:05:06.3 |
HIP 27140 |
10.16 |
| 2026-06-15 12:00 |
05:46:00.57 |
-50:05:05.5 |
HIP 27140 |
10.38 |
| 2026-06-16 00:00 |
05:46:02.48 |
-50:05:04.8 |
HIP 27140 |
10.61 |
| 2026-06-16 12:00 |
05:46:04.40 |
-50:05:04.2 |
HIP 27140 |
10.83 |
| 2026-06-17 00:00 |
05:46:06.31 |
-50:05:03.9 |
HIP 27140 |
11.06 |
| 2026-06-17 12:00 |
05:46:08.23 |
-50:05:03.6 |
HIP 27140 |
11.29 |
| 2026-06-18 00:00 |
05:46:10.14 |
-50:05:03.5 |
HIP 27140 |
11.52 |
| 2026-06-18 12:00 |
05:46:12.06 |
-50:05:03.6 |
HIP 27140 |
11.76 |
| 2026-06-19 00:00 |
05:46:13.98 |
-50:05:03.8 |
HIP 27140 |
12.00 |
| 2026-06-19 12:00 |
05:46:15.89 |
-50:05:04.1 |
HIP 27140 |
12.23 |
| 2026-06-20 00:00 |
05:46:17.81 |
-50:05:04.6 |
HIP 27140 |
12.47 |
| 2026-06-20 12:00 |
05:46:19.72 |
-50:05:05.3 |
HIP 27140 |
12.71 |
| 2026-06-21 00:00 |
05:46:21.64 |
-50:05:06.1 |
HIP 27140 |
12.95 |
| 2026-06-21 12:00 |
05:46:23.55 |
-50:05:07.0 |
HIP 27140 |
13.20 |
| 2026-06-22 00:00 |
05:46:25.46 |
-50:05:08.1 |
HIP 27367 |
13.17 |