| 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) |
| 2026-05-12 00:00 |
05:43:57.24 |
-50:11:39.0 |
HIP 27140 |
12.55 |
| 2026-05-12 12:00 |
05:43:58.80 |
-50:11:28.7 |
HIP 27140 |
12.32 |
| 2026-05-13 00:00 |
05:44:00.38 |
-50:11:18.6 |
HIP 27140 |
12.08 |
| 2026-05-13 12:00 |
05:44:01.96 |
-50:11:08.5 |
HIP 27140 |
11.85 |
| 2026-05-14 00:00 |
05:44:03.56 |
-50:10:58.6 |
HIP 27140 |
11.62 |
| 2026-05-14 12:00 |
05:44:05.16 |
-50:10:48.8 |
HIP 27140 |
11.39 |
| 2026-05-15 00:00 |
05:44:06.77 |
-50:10:39.1 |
HIP 27140 |
11.16 |
| 2026-05-15 12:00 |
05:44:08.39 |
-50:10:29.6 |
HIP 27140 |
10.93 |
| 2026-05-16 00:00 |
05:44:10.02 |
-50:10:20.2 |
HIP 27140 |
10.71 |
| 2026-05-16 12:00 |
05:44:11.66 |
-50:10:10.9 |
HIP 27140 |
10.49 |
| 2026-05-17 00:00 |
05:44:13.31 |
-50:10:01.7 |
HIP 27140 |
10.27 |
| 2026-05-17 12:00 |
05:44:14.96 |
-50:09:52.7 |
HIP 27140 |
10.05 |
| 2026-05-18 00:00 |
05:44:16.62 |
-50:09:43.8 |
HIP 27140 |
9.84 |
| 2026-05-18 12:00 |
05:44:18.29 |
-50:09:35.0 |
HIP 27140 |
9.62 |
| 2026-05-19 00:00 |
05:44:19.97 |
-50:09:26.4 |
HIP 27140 |
9.42 |
| 2026-05-19 12:00 |
05:44:21.66 |
-50:09:17.9 |
HIP 27140 |
9.21 |
| 2026-05-20 00:00 |
05:44:23.35 |
-50:09:09.5 |
HIP 27140 |
9.01 |
| 2026-05-20 12:00 |
05:44:25.05 |
-50:09:01.3 |
HIP 27140 |
8.81 |
| 2026-05-21 00:00 |
05:44:26.76 |
-50:08:53.2 |
HIP 27140 |
8.62 |
| 2026-05-21 12:00 |
05:44:28.47 |
-50:08:45.2 |
HIP 27140 |
8.43 |
| 2026-05-22 00:00 |
05:44:30.19 |
-50:08:37.4 |
HIP 27140 |
8.25 |
| 2026-05-22 12:00 |
05:44:31.92 |
-50:08:29.7 |
HIP 27140 |
8.07 |
| 2026-05-23 00:00 |
05:44:33.66 |
-50:08:22.1 |
HIP 27140 |
7.90 |
| 2026-05-23 12:00 |
05:44:35.40 |
-50:08:14.7 |
HIP 27140 |
7.73 |
| 2026-05-24 00:00 |
05:44:37.15 |
-50:08:07.4 |
HIP 27140 |
7.57 |
| 2026-05-24 12:00 |
05:44:38.90 |
-50:08:00.2 |
HIP 27140 |
7.42 |
| 2026-05-25 00:00 |
05:44:40.66 |
-50:07:53.2 |
HIP 27140 |
7.27 |
| 2026-05-25 12:00 |
05:44:42.43 |
-50:07:46.3 |
HIP 27140 |
7.13 |
| 2026-05-26 00:00 |
05:44:44.20 |
-50:07:39.6 |
HIP 27140 |
7.00 |
| 2026-05-26 12:00 |
05:44:45.98 |
-50:07:33.0 |
HIP 27140 |
6.88 |
| 2026-05-27 00:00 |
05:44:47.77 |
-50:07:26.5 |
HIP 27140 |
6.77 |
| 2026-05-27 12:00 |
05:44:49.56 |
-50:07:20.2 |
HIP 27140 |
6.67 |
| 2026-05-28 00:00 |
05:44:51.35 |
-50:07:14.0 |
HIP 27140 |
6.57 |
| 2026-05-28 12:00 |
05:44:53.15 |
-50:07:08.0 |
HIP 27140 |
6.49 |
| 2026-05-29 00:00 |
05:44:54.96 |
-50:07:02.0 |
HIP 27140 |
6.42 |
| 2026-05-29 12:00 |
05:44:56.77 |
-50:06:56.3 |
HIP 27140 |
6.36 |
| 2026-05-30 00:00 |
05:44:58.59 |
-50:06:50.6 |
HIP 27140 |
6.32 |
| 2026-05-30 12:00 |
05:45:00.41 |
-50:06:45.2 |
HIP 27140 |
6.28 |
| 2026-05-31 00:00 |
05:45:02.24 |
-50:06:39.8 |
HIP 27140 |
6.26 |
| 2026-05-31 12:00 |
05:45:04.07 |
-50:06:34.6 |
HIP 27140 |
6.25 |
| 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 |