| Parameter |
Value |
| Designation |
C/1948 L1 (Honda-Bernasconi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-05-15T23:03:10.120320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1948-06-25.0000000 |
| e |
1.00103010 |
| q (au) |
0.206577 |
| a (au) |
-200.540589 |
| i (deg) |
23.190084 |
| Ω (om, deg) |
203.661991 |
| ω (w, deg) |
317.153520 |
| M (ma, deg) |
0.013896 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.694 + 4.502\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.694 |
| n |
4.502 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
22:10:34.79 |
+07:11:31.5 |
HIP 109530 |
23.37 |
| 2026-09-25 12:00 |
22:10:33.90 |
+07:11:23.9 |
HIP 109530 |
23.35 |
| 2026-09-26 00:00 |
22:10:33.03 |
+07:11:16.4 |
HIP 109530 |
23.34 |
| 2026-09-26 12:00 |
22:10:32.15 |
+07:11:08.8 |
HIP 109530 |
23.32 |
| 2026-09-27 00:00 |
22:10:31.29 |
+07:11:01.2 |
HIP 109530 |
23.30 |
| 2026-09-27 12:00 |
22:10:30.42 |
+07:10:53.6 |
HIP 109530 |
23.29 |
| 2026-09-28 00:00 |
22:10:29.56 |
+07:10:46.0 |
HIP 109530 |
23.28 |
| 2026-09-28 12:00 |
22:10:28.71 |
+07:10:38.3 |
HIP 109530 |
23.27 |
| 2026-09-29 00:00 |
22:10:27.86 |
+07:10:30.7 |
HIP 109530 |
23.27 |
| 2026-09-29 12:00 |
22:10:27.02 |
+07:10:23.1 |
HIP 109530 |
23.26 |
| 2026-09-30 00:00 |
22:10:26.18 |
+07:10:15.4 |
HIP 109530 |
23.26 |
| 2026-09-30 12:00 |
22:10:25.35 |
+07:10:07.8 |
HIP 109530 |
23.26 |
| 2026-10-01 00:00 |
22:10:24.53 |
+07:10:00.1 |
HIP 109530 |
23.26 |
| 2026-10-01 12:00 |
22:10:23.71 |
+07:09:52.4 |
HIP 109530 |
23.26 |
| 2026-10-02 00:00 |
22:10:22.89 |
+07:09:44.7 |
HIP 109530 |
23.26 |
| 2026-10-02 12:00 |
22:10:22.08 |
+07:09:37.0 |
HIP 109530 |
23.27 |
| 2026-10-03 00:00 |
22:10:21.28 |
+07:09:29.3 |
HIP 109530 |
23.27 |
| 2026-10-03 12:00 |
22:10:20.48 |
+07:09:21.7 |
HIP 109530 |
23.28 |
| 2026-10-04 00:00 |
22:10:19.68 |
+07:09:13.9 |
HIP 109530 |
23.29 |
| 2026-10-04 12:00 |
22:10:18.90 |
+07:09:06.2 |
HIP 109530 |
23.30 |
| 2026-10-05 00:00 |
22:10:18.12 |
+07:08:58.5 |
HIP 109530 |
23.31 |
| 2026-10-05 12:00 |
22:10:17.34 |
+07:08:50.8 |
HIP 109530 |
23.33 |
| 2026-10-06 00:00 |
22:10:16.57 |
+07:08:43.1 |
HIP 109530 |
23.34 |
| 2026-10-06 12:00 |
22:10:15.81 |
+07:08:35.4 |
HIP 109530 |
23.36 |
| 2026-10-07 00:00 |
22:10:15.05 |
+07:08:27.7 |
HIP 109530 |
23.38 |
| 2026-10-07 12:00 |
22:10:14.30 |
+07:08:20.0 |
HIP 109530 |
23.40 |
| 2026-10-08 00:00 |
22:10:13.56 |
+07:08:12.2 |
HIP 109530 |
23.42 |
| 2026-10-08 12:00 |
22:10:12.82 |
+07:08:04.5 |
HIP 109530 |
23.44 |
| 2026-10-09 00:00 |
22:10:12.09 |
+07:07:56.8 |
HIP 109530 |
23.46 |
| 2026-10-09 12:00 |
22:10:11.37 |
+07:07:49.1 |
HIP 109530 |
23.48 |
| 2026-10-10 00:00 |
22:10:10.65 |
+07:07:41.4 |
HIP 109530 |
23.51 |
| 2026-10-10 12:00 |
22:10:09.94 |
+07:07:33.7 |
HIP 109530 |
23.53 |
| 2026-10-11 00:00 |
22:10:09.23 |
+07:07:26.0 |
HIP 109530 |
23.56 |
| 2026-10-11 12:00 |
22:10:08.54 |
+07:07:18.3 |
HIP 109530 |
23.59 |
| 2026-10-12 00:00 |
22:10:07.85 |
+07:07:10.6 |
HIP 109530 |
23.61 |
| 2026-10-12 12:00 |
22:10:07.16 |
+07:07:02.9 |
HIP 109530 |
23.64 |
| 2026-10-13 00:00 |
22:10:06.48 |
+07:06:55.3 |
HIP 109530 |
23.67 |
| 2026-10-13 12:00 |
22:10:05.81 |
+07:06:47.6 |
HIP 109530 |
23.70 |
| 2026-10-14 00:00 |
22:10:05.15 |
+07:06:40.0 |
HIP 109530 |
23.73 |
| 2026-10-14 12:00 |
22:10:04.49 |
+07:06:32.3 |
HIP 109309 |
23.70 |
| 2026-10-15 00:00 |
22:10:03.85 |
+07:06:24.7 |
HIP 109309 |
23.64 |
| 2026-10-15 12:00 |
22:10:03.20 |
+07:06:17.0 |
HIP 109309 |
23.58 |
| 2026-10-16 00:00 |
22:10:02.57 |
+07:06:09.4 |
HIP 109309 |
23.53 |