| Parameter |
Value |
| Designation |
C/1954 Y1 (Haro-Chavira) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1956-01-26T17:36:40.613760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1956-08-14.0000000 |
| e |
1.00460292 |
| q (au) |
4.076984 |
| a (au) |
-885.738904 |
| i (deg) |
79.600837 |
| Ω (om, deg) |
72.875012 |
| ω (w, deg) |
57.309578 |
| M (ma, deg) |
0.007488 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
16:53:48.58 |
-55:16:29.3 |
HIP 82663 |
12.17 |
| 2026-07-29 12:00 |
16:53:47.20 |
-55:16:20.7 |
HIP 82663 |
12.05 |
| 2026-07-30 00:00 |
16:53:45.84 |
-55:16:12.1 |
HIP 82663 |
11.93 |
| 2026-07-30 12:00 |
16:53:44.50 |
-55:16:03.4 |
HIP 82663 |
11.81 |
| 2026-07-31 00:00 |
16:53:43.17 |
-55:15:54.7 |
HIP 82663 |
11.69 |
| 2026-07-31 12:00 |
16:53:41.86 |
-55:15:46.0 |
HIP 82663 |
11.57 |
| 2026-08-01 00:00 |
16:53:40.56 |
-55:15:37.2 |
HIP 82663 |
11.46 |
| 2026-08-01 12:00 |
16:53:39.28 |
-55:15:28.3 |
HIP 82663 |
11.35 |
| 2026-08-02 00:00 |
16:53:38.01 |
-55:15:19.5 |
HIP 82663 |
11.25 |
| 2026-08-02 12:00 |
16:53:36.76 |
-55:15:10.5 |
HIP 82663 |
11.15 |
| 2026-08-03 00:00 |
16:53:35.52 |
-55:15:01.6 |
HIP 82663 |
11.04 |
| 2026-08-03 12:00 |
16:53:34.30 |
-55:14:52.6 |
HIP 82663 |
10.95 |
| 2026-08-04 00:00 |
16:53:33.10 |
-55:14:43.6 |
HIP 82663 |
10.85 |
| 2026-08-04 12:00 |
16:53:31.91 |
-55:14:34.5 |
HIP 82663 |
10.76 |
| 2026-08-05 00:00 |
16:53:30.73 |
-55:14:25.5 |
HIP 82663 |
10.67 |
| 2026-08-05 12:00 |
16:53:29.58 |
-55:14:16.3 |
HIP 82663 |
10.58 |
| 2026-08-06 00:00 |
16:53:28.44 |
-55:14:07.2 |
HIP 82663 |
10.50 |
| 2026-08-06 12:00 |
16:53:27.31 |
-55:13:58.0 |
HIP 82663 |
10.42 |
| 2026-08-07 00:00 |
16:53:26.21 |
-55:13:48.8 |
HIP 82663 |
10.34 |
| 2026-08-07 12:00 |
16:53:25.11 |
-55:13:39.5 |
HIP 82663 |
10.26 |
| 2026-08-08 00:00 |
16:53:24.04 |
-55:13:30.3 |
HIP 82663 |
10.19 |
| 2026-08-08 12:00 |
16:53:22.98 |
-55:13:21.0 |
HIP 82663 |
10.12 |
| 2026-08-09 00:00 |
16:53:21.94 |
-55:13:11.6 |
HIP 82663 |
10.05 |
| 2026-08-09 12:00 |
16:53:20.92 |
-55:13:02.3 |
HIP 82663 |
9.99 |
| 2026-08-10 00:00 |
16:53:19.91 |
-55:12:52.9 |
HIP 82663 |
9.92 |
| 2026-08-10 12:00 |
16:53:18.92 |
-55:12:43.5 |
HIP 82663 |
9.86 |
| 2026-08-11 00:00 |
16:53:17.94 |
-55:12:34.0 |
HIP 82663 |
9.81 |
| 2026-08-11 12:00 |
16:53:16.99 |
-55:12:24.6 |
HIP 82663 |
9.75 |
| 2026-08-12 00:00 |
16:53:16.05 |
-55:12:15.1 |
HIP 82663 |
9.70 |
| 2026-08-12 12:00 |
16:53:15.12 |
-55:12:05.6 |
HIP 82663 |
9.65 |
| 2026-08-13 00:00 |
16:53:14.22 |
-55:11:56.0 |
HIP 82663 |
9.60 |
| 2026-08-13 12:00 |
16:53:13.33 |
-55:11:46.5 |
HIP 82663 |
9.55 |
| 2026-08-14 00:00 |
16:53:12.46 |
-55:11:36.9 |
HIP 82663 |
9.51 |
| 2026-08-14 12:00 |
16:53:11.61 |
-55:11:27.3 |
HIP 82663 |
9.47 |
| 2026-08-15 00:00 |
16:53:10.78 |
-55:11:17.7 |
HIP 82663 |
9.43 |
| 2026-08-15 12:00 |
16:53:09.96 |
-55:11:08.1 |
HIP 82663 |
9.39 |
| 2026-08-16 00:00 |
16:53:09.16 |
-55:10:58.4 |
HIP 82663 |
9.36 |
| 2026-08-16 12:00 |
16:53:08.38 |
-55:10:48.7 |
HIP 82663 |
9.33 |
| 2026-08-17 00:00 |
16:53:07.61 |
-55:10:39.1 |
HIP 82663 |
9.30 |
| 2026-08-17 12:00 |
16:53:06.87 |
-55:10:29.4 |
HIP 82663 |
9.27 |
| 2026-08-18 00:00 |
16:53:06.14 |
-55:10:19.7 |
HIP 82663 |
9.24 |
| 2026-08-18 12:00 |
16:53:05.43 |
-55:10:09.9 |
HIP 82663 |
9.21 |
| 2026-08-19 00:00 |
16:53:04.74 |
-55:10:00.2 |
HIP 82663 |
9.19 |