| Parameter |
Value |
| Designation |
C/1932 H1 (Carrasco) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1931-11-29T19:41:48.048000Z |
| Orbit solution date (soln_date, UTC) |
2023-12-05T08:04:21Z |
| Obs used |
6 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1932-04-30.0000000 |
| e |
1.00010577 |
| q (au) |
2.318385 |
| a (au) |
-21919.100180 |
| i (deg) |
58.083496 |
| Ω (om, deg) |
18.797874 |
| ω (w, deg) |
109.807035 |
| M (ma, deg) |
0.000046 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.489 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.489 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-09-20 00:00 |
22:21:49.35 |
-75:53:13.6 |
HIP 110237 |
15.89 |
| 2026-09-20 12:00 |
22:21:45.77 |
-75:53:09.7 |
HIP 110237 |
15.85 |
| 2026-09-21 00:00 |
22:21:42.21 |
-75:53:05.5 |
HIP 110237 |
15.82 |
| 2026-09-21 12:00 |
22:21:38.66 |
-75:53:01.3 |
HIP 110237 |
15.79 |
| 2026-09-22 00:00 |
22:21:35.13 |
-75:52:57.0 |
HIP 110237 |
15.77 |
| 2026-09-22 12:00 |
22:21:31.62 |
-75:52:52.5 |
HIP 110237 |
15.75 |
| 2026-09-23 00:00 |
22:21:28.12 |
-75:52:47.9 |
HIP 110237 |
15.74 |
| 2026-09-23 12:00 |
22:21:24.63 |
-75:52:43.2 |
HIP 110237 |
15.73 |
| 2026-09-24 00:00 |
22:21:21.16 |
-75:52:38.3 |
HIP 110237 |
15.73 |
| 2026-09-24 12:00 |
22:21:17.71 |
-75:52:33.4 |
HIP 110237 |
15.73 |
| 2026-09-25 00:00 |
22:21:14.28 |
-75:52:28.3 |
HIP 110237 |
15.74 |
| 2026-09-25 12:00 |
22:21:10.86 |
-75:52:23.1 |
HIP 110237 |
15.76 |
| 2026-09-26 00:00 |
22:21:07.46 |
-75:52:17.8 |
HIP 110237 |
15.78 |
| 2026-09-26 12:00 |
22:21:04.08 |
-75:52:12.4 |
HIP 110237 |
15.80 |
| 2026-09-27 00:00 |
22:21:00.72 |
-75:52:06.8 |
HIP 110237 |
15.83 |
| 2026-09-27 12:00 |
22:20:57.37 |
-75:52:01.2 |
HIP 110237 |
15.87 |
| 2026-09-28 00:00 |
22:20:54.04 |
-75:51:55.4 |
HIP 110237 |
15.91 |
| 2026-09-28 12:00 |
22:20:50.73 |
-75:51:49.5 |
HIP 110237 |
15.96 |
| 2026-09-29 00:00 |
22:20:47.44 |
-75:51:43.5 |
HIP 110237 |
16.01 |
| 2026-09-29 12:00 |
22:20:44.17 |
-75:51:37.3 |
HIP 110237 |
16.07 |
| 2026-09-30 00:00 |
22:20:40.92 |
-75:51:31.1 |
HIP 110237 |
16.13 |
| 2026-09-30 12:00 |
22:20:37.69 |
-75:51:24.7 |
HIP 110237 |
16.19 |
| 2026-10-01 00:00 |
22:20:34.48 |
-75:51:18.2 |
HIP 110237 |
16.27 |
| 2026-10-01 12:00 |
22:20:31.29 |
-75:51:11.6 |
HIP 110237 |
16.34 |
| 2026-10-02 00:00 |
22:20:28.11 |
-75:51:04.9 |
HIP 110237 |
16.42 |
| 2026-10-02 12:00 |
22:20:24.96 |
-75:50:58.1 |
HIP 110237 |
16.51 |
| 2026-10-03 00:00 |
22:20:21.83 |
-75:50:51.2 |
HIP 110237 |
16.60 |
| 2026-10-03 12:00 |
22:20:18.73 |
-75:50:44.1 |
HIP 110237 |
16.69 |
| 2026-10-04 00:00 |
22:20:15.64 |
-75:50:37.0 |
HIP 110237 |
16.79 |
| 2026-10-04 12:00 |
22:20:12.57 |
-75:50:29.7 |
HIP 110237 |
16.90 |
| 2026-10-05 00:00 |
22:20:09.53 |
-75:50:22.3 |
HIP 110237 |
17.00 |
| 2026-10-05 12:00 |
22:20:06.51 |
-75:50:14.8 |
HIP 110237 |
17.12 |
| 2026-10-06 00:00 |
22:20:03.51 |
-75:50:07.2 |
HIP 110237 |
17.23 |
| 2026-10-06 12:00 |
22:20:00.54 |
-75:49:59.5 |
HIP 110237 |
17.35 |
| 2026-10-07 00:00 |
22:19:57.58 |
-75:49:51.7 |
HIP 110237 |
17.47 |
| 2026-10-07 12:00 |
22:19:54.66 |
-75:49:43.8 |
HIP 110237 |
17.60 |
| 2026-10-08 00:00 |
22:19:51.75 |
-75:49:35.7 |
HIP 110237 |
17.73 |
| 2026-10-08 12:00 |
22:19:48.87 |
-75:49:27.6 |
HIP 110237 |
17.87 |
| 2026-10-09 00:00 |
22:19:46.01 |
-75:49:19.3 |
HIP 110237 |
18.00 |
| 2026-10-09 12:00 |
22:19:43.18 |
-75:49:10.9 |
HIP 110237 |
18.15 |
| 2026-10-10 00:00 |
22:19:40.37 |
-75:49:02.5 |
HIP 110237 |
18.29 |
| 2026-10-10 12:00 |
22:19:37.59 |
-75:48:53.9 |
HIP 110237 |
18.44 |
| 2026-10-11 00:00 |
22:19:34.83 |
-75:48:45.2 |
HIP 110237 |
18.59 |