C/1948 V1 (Eclipse comet)
| Parameter |
Value |
| Designation |
C/1948 V1 (Eclipse comet) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-10-27T10:14:33.031680Z |
| 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) |
1949-01-10.0000000 |
| e |
0.99991400 |
| q (au) |
0.135439 |
| a (au) |
1574.787178 |
| i (deg) |
23.116272 |
| Ω (om, deg) |
211.042719 |
| ω (w, deg) |
107.249362 |
| M (ma, deg) |
0.001176 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.919 + 4.296\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.919 |
| n |
4.296 |
| gf |
0.800 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1948-11-08 |
1948-11-13 |
-7.0600 |
-0.591 |
| 1948-11-13 |
1948-11-28 |
-8.2022 |
-0.494 |
| 1948-11-28 |
1949-04-01 |
+0.0415 |
+0.079 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:44:59.61 |
-05:29:29.0 |
HIP 42880 |
25.69 |
| 2026-02-03 12:00 |
08:44:58.46 |
-05:29:24.1 |
HIP 42880 |
25.51 |
| 2026-02-04 00:00 |
08:44:57.31 |
-05:29:19.2 |
HIP 42880 |
25.33 |
| 2026-02-04 12:00 |
08:44:56.16 |
-05:29:14.2 |
HIP 42880 |
25.15 |
| 2026-02-05 00:00 |
08:44:55.02 |
-05:29:09.2 |
HIP 42880 |
24.97 |
| 2026-02-05 12:00 |
08:44:53.87 |
-05:29:04.0 |
HIP 42880 |
24.80 |
| 2026-02-06 00:00 |
08:44:52.73 |
-05:28:58.9 |
HIP 42880 |
24.62 |
| 2026-02-06 12:00 |
08:44:51.59 |
-05:28:53.6 |
HIP 42880 |
24.45 |
| 2026-02-07 00:00 |
08:44:50.45 |
-05:28:48.4 |
HIP 42880 |
24.28 |
| 2026-02-07 12:00 |
08:44:49.31 |
-05:28:43.0 |
HIP 42880 |
24.11 |
| 2026-02-08 00:00 |
08:44:48.17 |
-05:28:37.6 |
HIP 42880 |
23.94 |
| 2026-02-08 12:00 |
08:44:47.04 |
-05:28:32.2 |
HIP 42880 |
23.77 |
| 2026-02-09 00:00 |
08:44:45.90 |
-05:28:26.7 |
HIP 42880 |
23.61 |
| 2026-02-09 12:00 |
08:44:44.77 |
-05:28:21.1 |
HIP 42880 |
23.45 |
| 2026-02-10 00:00 |
08:44:43.64 |
-05:28:15.5 |
HIP 42880 |
23.28 |
| 2026-02-10 12:00 |
08:44:42.51 |
-05:28:09.8 |
HIP 42880 |
23.13 |
| 2026-02-11 00:00 |
08:44:41.39 |
-05:28:04.1 |
HIP 42880 |
22.97 |
| 2026-02-11 12:00 |
08:44:40.27 |
-05:27:58.4 |
HIP 42880 |
22.81 |
| 2026-02-12 00:00 |
08:44:39.15 |
-05:27:52.5 |
HIP 42880 |
22.66 |
| 2026-02-12 12:00 |
08:44:38.03 |
-05:27:46.7 |
HIP 42880 |
22.51 |
| 2026-02-13 00:00 |
08:44:36.91 |
-05:27:40.7 |
HIP 42880 |
22.36 |
| 2026-02-13 12:00 |
08:44:35.80 |
-05:27:34.8 |
HIP 42880 |
22.21 |
| 2026-02-14 00:00 |
08:44:34.69 |
-05:27:28.7 |
HIP 42880 |
22.07 |
| 2026-02-14 12:00 |
08:44:33.58 |
-05:27:22.7 |
HIP 42880 |
21.93 |
| 2026-02-15 00:00 |
08:44:32.48 |
-05:27:16.5 |
HIP 42880 |
21.79 |
| 2026-02-15 12:00 |
08:44:31.38 |
-05:27:10.4 |
HIP 42880 |
21.65 |
| 2026-02-16 00:00 |
08:44:30.28 |
-05:27:04.1 |
HIP 42880 |
21.52 |
| 2026-02-16 12:00 |
08:44:29.18 |
-05:26:57.9 |
HIP 42880 |
21.38 |
| 2026-02-17 00:00 |
08:44:28.09 |
-05:26:51.5 |
HIP 42880 |
21.25 |
| 2026-02-17 12:00 |
08:44:27.01 |
-05:26:45.2 |
HIP 42880 |
21.13 |
| 2026-02-18 00:00 |
08:44:25.92 |
-05:26:38.8 |
HIP 42880 |
21.00 |
| 2026-02-18 12:00 |
08:44:24.84 |
-05:26:32.3 |
HIP 42880 |
20.88 |
| 2026-02-19 00:00 |
08:44:23.76 |
-05:26:25.8 |
HIP 42880 |
20.76 |
| 2026-02-19 12:00 |
08:44:22.69 |
-05:26:19.3 |
HIP 42880 |
20.64 |
| 2026-02-20 00:00 |
08:44:21.62 |
-05:26:12.7 |
HIP 42880 |
20.53 |
| 2026-02-20 12:00 |
08:44:20.55 |
-05:26:06.1 |
HIP 42880 |
20.42 |
| 2026-02-21 00:00 |
08:44:19.49 |
-05:25:59.4 |
HIP 42880 |
20.31 |
| 2026-02-21 12:00 |
08:44:18.43 |
-05:25:52.7 |
HIP 42880 |
20.20 |
| 2026-02-22 00:00 |
08:44:17.38 |
-05:25:45.9 |
HIP 42880 |
20.10 |
| 2026-02-22 12:00 |
08:44:16.33 |
-05:25:39.1 |
HIP 42880 |
20.00 |
| 2026-02-23 00:00 |
08:44:15.29 |
-05:25:32.3 |
HIP 42880 |
19.90 |
| 2026-02-23 12:00 |
08:44:14.25 |
-05:25:25.4 |
HIP 42880 |
19.80 |
| 2026-02-24 00:00 |
08:44:13.21 |
-05:25:18.5 |
HIP 42880 |
19.71 |