| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
08:43:02.48 |
-05:06:00.4 |
HIP 42880 |
19.48 |
| 2026-05-12 12:00 |
08:43:02.72 |
-05:05:54.6 |
HIP 42880 |
19.42 |
| 2026-05-13 00:00 |
08:43:02.97 |
-05:05:48.8 |
HIP 42880 |
19.35 |
| 2026-05-13 12:00 |
08:43:03.23 |
-05:05:43.1 |
HIP 42880 |
19.29 |
| 2026-05-14 00:00 |
08:43:03.50 |
-05:05:37.4 |
HIP 42880 |
19.22 |
| 2026-05-14 12:00 |
08:43:03.78 |
-05:05:31.8 |
HIP 42880 |
19.15 |
| 2026-05-15 00:00 |
08:43:04.07 |
-05:05:26.3 |
HIP 42880 |
19.08 |
| 2026-05-15 12:00 |
08:43:04.36 |
-05:05:20.8 |
HIP 42880 |
19.01 |
| 2026-05-16 00:00 |
08:43:04.67 |
-05:05:15.3 |
HIP 42880 |
18.93 |
| 2026-05-16 12:00 |
08:43:04.99 |
-05:05:09.9 |
HIP 42880 |
18.86 |
| 2026-05-17 00:00 |
08:43:05.31 |
-05:05:04.6 |
HIP 42880 |
18.78 |
| 2026-05-17 12:00 |
08:43:05.64 |
-05:04:59.3 |
HIP 42880 |
18.70 |
| 2026-05-18 00:00 |
08:43:05.99 |
-05:04:54.0 |
HIP 42880 |
18.62 |
| 2026-05-18 12:00 |
08:43:06.34 |
-05:04:48.8 |
HIP 42880 |
18.54 |
| 2026-05-19 00:00 |
08:43:06.70 |
-05:04:43.7 |
HIP 42880 |
18.45 |
| 2026-05-19 12:00 |
08:43:07.07 |
-05:04:38.6 |
HIP 42880 |
18.36 |
| 2026-05-20 00:00 |
08:43:07.44 |
-05:04:33.6 |
HIP 42880 |
18.27 |
| 2026-05-20 12:00 |
08:43:07.83 |
-05:04:28.6 |
HIP 42880 |
18.18 |
| 2026-05-21 00:00 |
08:43:08.23 |
-05:04:23.7 |
HIP 42880 |
18.09 |
| 2026-05-21 12:00 |
08:43:08.63 |
-05:04:18.8 |
HIP 42880 |
18.00 |
| 2026-05-22 00:00 |
08:43:09.04 |
-05:04:14.0 |
HIP 42880 |
17.90 |
| 2026-05-22 12:00 |
08:43:09.47 |
-05:04:09.2 |
HIP 42880 |
17.80 |
| 2026-05-23 00:00 |
08:43:09.90 |
-05:04:04.5 |
HIP 42880 |
17.70 |
| 2026-05-23 12:00 |
08:43:10.33 |
-05:03:59.9 |
HIP 42880 |
17.60 |
| 2026-05-24 00:00 |
08:43:10.78 |
-05:03:55.3 |
HIP 42880 |
17.50 |
| 2026-05-24 12:00 |
08:43:11.24 |
-05:03:50.8 |
HIP 42880 |
17.39 |
| 2026-05-25 00:00 |
08:43:11.70 |
-05:03:46.3 |
HIP 42880 |
17.29 |
| 2026-05-25 12:00 |
08:43:12.18 |
-05:03:41.9 |
HIP 42880 |
17.18 |
| 2026-05-26 00:00 |
08:43:12.66 |
-05:03:37.5 |
HIP 42880 |
17.07 |
| 2026-05-26 12:00 |
08:43:13.15 |
-05:03:33.2 |
HIP 42880 |
16.95 |
| 2026-05-27 00:00 |
08:43:13.65 |
-05:03:29.0 |
HIP 42880 |
16.84 |
| 2026-05-27 12:00 |
08:43:14.15 |
-05:03:24.8 |
HIP 42880 |
16.72 |
| 2026-05-28 00:00 |
08:43:14.67 |
-05:03:20.6 |
HIP 42880 |
16.61 |
| 2026-05-28 12:00 |
08:43:15.19 |
-05:03:16.6 |
HIP 42880 |
16.49 |
| 2026-05-29 00:00 |
08:43:15.72 |
-05:03:12.6 |
HIP 42880 |
16.37 |
| 2026-05-29 12:00 |
08:43:16.26 |
-05:03:08.6 |
HIP 42880 |
16.24 |
| 2026-05-30 00:00 |
08:43:16.81 |
-05:03:04.7 |
HIP 42880 |
16.12 |
| 2026-05-30 12:00 |
08:43:17.36 |
-05:03:00.9 |
HIP 42880 |
15.99 |
| 2026-05-31 00:00 |
08:43:17.93 |
-05:02:57.1 |
HIP 42880 |
15.87 |
| 2026-05-31 12:00 |
08:43:18.50 |
-05:02:53.4 |
HIP 42880 |
15.74 |
| 2026-06-01 00:00 |
08:43:19.08 |
-05:02:49.7 |
HIP 42880 |
15.61 |
| 2026-06-01 12:00 |
08:43:19.66 |
-05:02:46.1 |
HIP 42880 |
15.47 |
| 2026-06-02 00:00 |
08:43:20.26 |
-05:02:42.6 |
HIP 42880 |
15.34 |