| Parameter |
Value |
| Designation |
C/1947 S1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-02-16T10:08:20.811840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1948-01-07.0000000 |
| e |
1.00034321 |
| q (au) |
0.748130 |
| a (au) |
-2179.799629 |
| i (deg) |
140.568676 |
| Ω (om, deg) |
271.438753 |
| ω (w, deg) |
350.213543 |
| M (ma, deg) |
-0.000391 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.180 + 3.781\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.180 |
| n |
3.781 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.952 |
| 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 |
| 1947-10-05 |
1948-01-12 |
+0.4348 |
-0.045 |
| 1948-02-28 |
1948-05-08 |
-2.2957 |
+0.187 |
| 1948-05-08 |
1949-02-06 |
+6.1259 |
-2.020 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
07:18:23.20 |
+34:41:56.5 |
HIP 35349 |
15.59 |
| 2026-03-26 12:00 |
07:18:22.85 |
+34:41:53.3 |
HIP 35349 |
15.63 |
| 2026-03-27 00:00 |
07:18:22.52 |
+34:41:50.1 |
HIP 35349 |
15.67 |
| 2026-03-27 12:00 |
07:18:22.20 |
+34:41:46.8 |
HIP 35349 |
15.70 |
| 2026-03-28 00:00 |
07:18:21.89 |
+34:41:43.5 |
HIP 35349 |
15.74 |
| 2026-03-28 12:00 |
07:18:21.59 |
+34:41:40.2 |
HIP 35349 |
15.79 |
| 2026-03-29 00:00 |
07:18:21.30 |
+34:41:36.8 |
HIP 35349 |
15.83 |
| 2026-03-29 12:00 |
07:18:21.03 |
+34:41:33.5 |
HIP 35349 |
15.87 |
| 2026-03-30 00:00 |
07:18:20.77 |
+34:41:30.1 |
HIP 35349 |
15.92 |
| 2026-03-30 12:00 |
07:18:20.52 |
+34:41:26.6 |
HIP 35349 |
15.96 |
| 2026-03-31 00:00 |
07:18:20.28 |
+34:41:23.2 |
HIP 35349 |
16.01 |
| 2026-03-31 12:00 |
07:18:20.05 |
+34:41:19.7 |
HIP 35349 |
16.06 |
| 2026-04-01 00:00 |
07:18:19.84 |
+34:41:16.2 |
HIP 35349 |
16.11 |
| 2026-04-01 12:00 |
07:18:19.63 |
+34:41:12.7 |
HIP 35349 |
16.16 |
| 2026-04-02 00:00 |
07:18:19.44 |
+34:41:09.2 |
HIP 35349 |
16.21 |
| 2026-04-02 12:00 |
07:18:19.26 |
+34:41:05.7 |
HIP 35349 |
16.26 |
| 2026-04-03 00:00 |
07:18:19.10 |
+34:41:02.1 |
HIP 35349 |
16.31 |
| 2026-04-03 12:00 |
07:18:18.94 |
+34:40:58.5 |
HIP 35349 |
16.37 |
| 2026-04-04 00:00 |
07:18:18.80 |
+34:40:54.9 |
HIP 35349 |
16.42 |
| 2026-04-04 12:00 |
07:18:18.67 |
+34:40:51.2 |
HIP 35349 |
16.48 |
| 2026-04-05 00:00 |
07:18:18.55 |
+34:40:47.6 |
HIP 35349 |
16.53 |
| 2026-04-05 12:00 |
07:18:18.44 |
+34:40:43.9 |
HIP 35349 |
16.59 |
| 2026-04-06 00:00 |
07:18:18.34 |
+34:40:40.2 |
HIP 35349 |
16.65 |
| 2026-04-06 12:00 |
07:18:18.26 |
+34:40:36.5 |
HIP 35349 |
16.71 |
| 2026-04-07 00:00 |
07:18:18.19 |
+34:40:32.7 |
HIP 35349 |
16.76 |
| 2026-04-07 12:00 |
07:18:18.13 |
+34:40:29.0 |
HIP 35349 |
16.82 |
| 2026-04-08 00:00 |
07:18:18.08 |
+34:40:25.2 |
HIP 35349 |
16.89 |
| 2026-04-08 12:00 |
07:18:18.04 |
+34:40:21.4 |
HIP 35349 |
16.95 |
| 2026-04-09 00:00 |
07:18:18.02 |
+34:40:17.6 |
HIP 35349 |
17.01 |
| 2026-04-09 12:00 |
07:18:18.01 |
+34:40:13.7 |
HIP 35349 |
17.07 |
| 2026-04-10 00:00 |
07:18:18.01 |
+34:40:09.9 |
HIP 35349 |
17.13 |
| 2026-04-10 12:00 |
07:18:18.02 |
+34:40:06.0 |
HIP 35349 |
17.20 |
| 2026-04-11 00:00 |
07:18:18.04 |
+34:40:02.1 |
HIP 35349 |
17.26 |
| 2026-04-11 12:00 |
07:18:18.08 |
+34:39:58.2 |
HIP 35349 |
17.33 |
| 2026-04-12 00:00 |
07:18:18.13 |
+34:39:54.3 |
HIP 35349 |
17.40 |
| 2026-04-12 12:00 |
07:18:18.19 |
+34:39:50.3 |
HIP 35349 |
17.46 |
| 2026-04-13 00:00 |
07:18:18.26 |
+34:39:46.4 |
HIP 35349 |
17.53 |
| 2026-04-13 12:00 |
07:18:18.34 |
+34:39:42.4 |
HIP 35349 |
17.60 |
| 2026-04-14 00:00 |
07:18:18.44 |
+34:39:38.4 |
HIP 35349 |
17.67 |
| 2026-04-14 12:00 |
07:18:18.54 |
+34:39:34.4 |
HIP 35349 |
17.74 |
| 2026-04-15 00:00 |
07:18:18.66 |
+34:39:30.4 |
HIP 35349 |
17.81 |
| 2026-04-15 12:00 |
07:18:18.79 |
+34:39:26.4 |
HIP 35349 |
17.88 |
| 2026-04-16 00:00 |
07:18:18.93 |
+34:39:22.3 |
HIP 35349 |
17.95 |