| Parameter |
Value |
| Designation |
C/1963 R1 (Pereyra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1963-08-23T23:19:43.055040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1963-10-25.0000000 |
| e |
0.99994492 |
| q (au) |
0.005021 |
| a (au) |
91.149463 |
| i (deg) |
144.594816 |
| Ω (om, deg) |
8.051859 |
| ω (w, deg) |
86.230920 |
| M (ma, deg) |
0.070252 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.625 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.625 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-06-01 00:00 |
06:43:17.26 |
-11:59:30.2 |
HIP 32183 |
12.93 |
| 2026-06-01 12:00 |
06:43:18.55 |
-11:59:25.1 |
HIP 32183 |
12.89 |
| 2026-06-02 00:00 |
06:43:19.85 |
-11:59:20.0 |
HIP 32183 |
12.87 |
| 2026-06-02 12:00 |
06:43:21.15 |
-11:59:15.1 |
HIP 32183 |
12.86 |
| 2026-06-03 00:00 |
06:43:22.46 |
-11:59:10.2 |
HIP 32183 |
12.86 |
| 2026-06-03 12:00 |
06:43:23.77 |
-11:59:05.5 |
HIP 32183 |
12.87 |
| 2026-06-04 00:00 |
06:43:25.09 |
-11:59:00.8 |
HIP 32183 |
12.88 |
| 2026-06-04 12:00 |
06:43:26.42 |
-11:58:56.3 |
HIP 32183 |
12.91 |
| 2026-06-05 00:00 |
06:43:27.75 |
-11:58:51.9 |
HIP 32183 |
12.95 |
| 2026-06-05 12:00 |
06:43:29.09 |
-11:58:47.5 |
HIP 32183 |
13.00 |
| 2026-06-06 00:00 |
06:43:30.43 |
-11:58:43.3 |
HIP 32183 |
13.07 |
| 2026-06-06 12:00 |
06:43:31.78 |
-11:58:39.1 |
HIP 32183 |
13.14 |
| 2026-06-07 00:00 |
06:43:33.13 |
-11:58:35.1 |
HIP 32183 |
13.22 |
| 2026-06-07 12:00 |
06:43:34.49 |
-11:58:31.2 |
HIP 32183 |
13.31 |
| 2026-06-08 00:00 |
06:43:35.86 |
-11:58:27.3 |
HIP 32183 |
13.41 |
| 2026-06-08 12:00 |
06:43:37.22 |
-11:58:23.6 |
HIP 32183 |
13.53 |
| 2026-06-09 00:00 |
06:43:38.60 |
-11:58:20.0 |
HIP 32183 |
13.65 |
| 2026-06-09 12:00 |
06:43:39.97 |
-11:58:16.4 |
HIP 32183 |
13.78 |
| 2026-06-10 00:00 |
06:43:41.36 |
-11:58:13.0 |
HIP 32183 |
13.92 |
| 2026-06-10 12:00 |
06:43:42.74 |
-11:58:09.7 |
HIP 32183 |
14.07 |
| 2026-06-11 00:00 |
06:43:44.13 |
-11:58:06.5 |
HIP 32183 |
14.23 |
| 2026-06-11 12:00 |
06:43:45.53 |
-11:58:03.4 |
HIP 32183 |
14.39 |
| 2026-06-12 00:00 |
06:43:46.93 |
-11:58:00.3 |
HIP 32183 |
14.57 |
| 2026-06-12 12:00 |
06:43:48.33 |
-11:57:57.4 |
HIP 32183 |
14.75 |
| 2026-06-13 00:00 |
06:43:49.74 |
-11:57:54.6 |
HIP 32183 |
14.94 |
| 2026-06-13 12:00 |
06:43:51.15 |
-11:57:51.9 |
HIP 32183 |
15.14 |
| 2026-06-14 00:00 |
06:43:52.57 |
-11:57:49.4 |
HIP 32183 |
15.34 |
| 2026-06-14 12:00 |
06:43:53.98 |
-11:57:46.9 |
HIP 32183 |
15.56 |
| 2026-06-15 00:00 |
06:43:55.41 |
-11:57:44.5 |
HIP 32183 |
15.78 |
| 2026-06-15 12:00 |
06:43:56.83 |
-11:57:42.2 |
HIP 32183 |
16.00 |
| 2026-06-16 00:00 |
06:43:58.26 |
-11:57:40.1 |
HIP 32183 |
16.23 |
| 2026-06-16 12:00 |
06:43:59.70 |
-11:57:38.0 |
HIP 32183 |
16.47 |
| 2026-06-17 00:00 |
06:44:01.13 |
-11:57:36.0 |
HIP 32183 |
16.71 |
| 2026-06-17 12:00 |
06:44:02.57 |
-11:57:34.2 |
HIP 32183 |
16.96 |
| 2026-06-18 00:00 |
06:44:04.01 |
-11:57:32.5 |
HIP 32183 |
17.22 |
| 2026-06-18 12:00 |
06:44:05.46 |
-11:57:30.8 |
HIP 32183 |
17.48 |
| 2026-06-19 00:00 |
06:44:06.90 |
-11:57:29.3 |
HIP 32183 |
17.74 |
| 2026-06-19 12:00 |
06:44:08.35 |
-11:57:27.9 |
HIP 32183 |
18.01 |
| 2026-06-20 00:00 |
06:44:09.81 |
-11:57:26.6 |
HIP 32183 |
18.29 |
| 2026-06-20 12:00 |
06:44:11.26 |
-11:57:25.4 |
HIP 32183 |
18.56 |
| 2026-06-21 00:00 |
06:44:12.72 |
-11:57:24.2 |
HIP 32183 |
18.85 |
| 2026-06-21 12:00 |
06:44:14.18 |
-11:57:23.3 |
HIP 32183 |
19.13 |
| 2026-06-22 00:00 |
06:44:15.64 |
-11:57:22.4 |
HIP 32183 |
19.42 |