| 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) |
| 2026-07-29 00:00 |
05:48:35.81 |
-50:13:02.0 |
HIP 27367 |
13.11 |
| 2026-07-29 12:00 |
05:48:37.30 |
-50:13:13.4 |
HIP 27367 |
13.41 |
| 2026-07-30 00:00 |
05:48:38.79 |
-50:13:24.8 |
HIP 27367 |
13.71 |
| 2026-07-30 12:00 |
05:48:40.26 |
-50:13:36.4 |
HIP 27367 |
14.00 |
| 2026-07-31 00:00 |
05:48:41.73 |
-50:13:48.0 |
HIP 27367 |
14.30 |
| 2026-07-31 12:00 |
05:48:43.18 |
-50:13:59.8 |
HIP 27367 |
14.60 |
| 2026-08-01 00:00 |
05:48:44.63 |
-50:14:11.7 |
HIP 27367 |
14.90 |
| 2026-08-01 12:00 |
05:48:46.06 |
-50:14:23.8 |
HIP 27367 |
15.20 |
| 2026-08-02 00:00 |
05:48:47.48 |
-50:14:35.9 |
HIP 27367 |
15.50 |
| 2026-08-02 12:00 |
05:48:48.90 |
-50:14:48.1 |
HIP 27367 |
15.80 |
| 2026-08-03 00:00 |
05:48:50.30 |
-50:15:00.5 |
HIP 27367 |
16.10 |
| 2026-08-03 12:00 |
05:48:51.69 |
-50:15:12.9 |
HIP 27367 |
16.41 |
| 2026-08-04 00:00 |
05:48:53.07 |
-50:15:25.5 |
HIP 27367 |
16.71 |
| 2026-08-04 12:00 |
05:48:54.44 |
-50:15:38.2 |
HIP 27367 |
17.01 |
| 2026-08-05 00:00 |
05:48:55.80 |
-50:15:51.0 |
HIP 27367 |
17.31 |
| 2026-08-05 12:00 |
05:48:57.15 |
-50:16:03.9 |
HIP 27367 |
17.62 |
| 2026-08-06 00:00 |
05:48:58.48 |
-50:16:16.9 |
HIP 27367 |
17.92 |
| 2026-08-06 12:00 |
05:48:59.81 |
-50:16:30.0 |
HIP 27367 |
18.22 |
| 2026-08-07 00:00 |
05:49:01.12 |
-50:16:43.2 |
HIP 27367 |
18.53 |
| 2026-08-07 12:00 |
05:49:02.42 |
-50:16:56.5 |
HIP 27367 |
18.83 |
| 2026-08-08 00:00 |
05:49:03.71 |
-50:17:09.9 |
HIP 27367 |
19.14 |
| 2026-08-08 12:00 |
05:49:04.99 |
-50:17:23.4 |
HIP 27367 |
19.44 |
| 2026-08-09 00:00 |
05:49:06.25 |
-50:17:37.1 |
HIP 27367 |
19.74 |
| 2026-08-09 12:00 |
05:49:07.51 |
-50:17:50.8 |
HIP 27647 |
19.90 |
| 2026-08-10 00:00 |
05:49:08.75 |
-50:18:04.6 |
HIP 27647 |
19.73 |
| 2026-08-10 12:00 |
05:49:09.98 |
-50:18:18.5 |
HIP 27647 |
19.57 |
| 2026-08-11 00:00 |
05:49:11.20 |
-50:18:32.5 |
HIP 27647 |
19.41 |
| 2026-08-11 12:00 |
05:49:12.40 |
-50:18:46.7 |
HIP 27647 |
19.26 |
| 2026-08-12 00:00 |
05:49:13.59 |
-50:19:00.9 |
HIP 27647 |
19.12 |
| 2026-08-12 12:00 |
05:49:14.77 |
-50:19:15.2 |
HIP 27647 |
18.98 |
| 2026-08-13 00:00 |
05:49:15.94 |
-50:19:29.6 |
HIP 27647 |
18.85 |
| 2026-08-13 12:00 |
05:49:17.09 |
-50:19:44.1 |
HIP 27647 |
18.72 |
| 2026-08-14 00:00 |
05:49:18.23 |
-50:19:58.7 |
HIP 27647 |
18.60 |
| 2026-08-14 12:00 |
05:49:19.36 |
-50:20:13.3 |
HIP 27647 |
18.49 |
| 2026-08-15 00:00 |
05:49:20.47 |
-50:20:28.1 |
HIP 27647 |
18.38 |
| 2026-08-15 12:00 |
05:49:21.57 |
-50:20:43.0 |
HIP 27647 |
18.28 |
| 2026-08-16 00:00 |
05:49:22.66 |
-50:20:57.9 |
HIP 27647 |
18.19 |
| 2026-08-16 12:00 |
05:49:23.74 |
-50:21:12.9 |
HIP 27647 |
18.10 |
| 2026-08-17 00:00 |
05:49:24.80 |
-50:21:28.0 |
HIP 27647 |
18.03 |
| 2026-08-17 12:00 |
05:49:25.84 |
-50:21:43.2 |
HIP 27647 |
17.96 |
| 2026-08-18 00:00 |
05:49:26.88 |
-50:21:58.5 |
HIP 27647 |
17.89 |
| 2026-08-18 12:00 |
05:49:27.90 |
-50:22:13.9 |
HIP 27647 |
17.84 |
| 2026-08-19 00:00 |
05:49:28.90 |
-50:22:29.3 |
HIP 27647 |
17.79 |