| Parameter |
Value |
| Designation |
C/1958 R1 (Burnham-Slaughter) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1959-03-11T12:29:09.669120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1959-04-21.0000000 |
| e |
0.99984492 |
| q (au) |
1.628202 |
| a (au) |
10499.160647 |
| i (deg) |
61.257360 |
| Ω (om, deg) |
323.778245 |
| ω (w, deg) |
100.736624 |
| M (ma, deg) |
0.000037 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.937 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.937 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
11:30:52.15 |
-69:45:17.0 |
HIP 56379 |
29.49 |
| 2026-05-12 12:00 |
11:30:50.39 |
-69:45:00.4 |
HIP 56379 |
29.80 |
| 2026-05-13 00:00 |
11:30:48.65 |
-69:44:43.7 |
HIP 56379 |
30.12 |
| 2026-05-13 12:00 |
11:30:46.94 |
-69:44:26.9 |
HIP 56379 |
30.44 |
| 2026-05-14 00:00 |
11:30:45.25 |
-69:44:10.1 |
HIP 56379 |
30.75 |
| 2026-05-14 12:00 |
11:30:43.59 |
-69:43:53.2 |
HIP 55720 |
30.74 |
| 2026-05-15 00:00 |
11:30:41.96 |
-69:43:36.3 |
HIP 55720 |
30.69 |
| 2026-05-15 12:00 |
11:30:40.36 |
-69:43:19.3 |
HIP 55720 |
30.65 |
| 2026-05-16 00:00 |
11:30:38.78 |
-69:43:02.3 |
HIP 55720 |
30.61 |
| 2026-05-16 12:00 |
11:30:37.23 |
-69:42:45.2 |
HIP 55720 |
30.58 |
| 2026-05-17 00:00 |
11:30:35.70 |
-69:42:28.0 |
HIP 55720 |
30.55 |
| 2026-05-17 12:00 |
11:30:34.20 |
-69:42:10.8 |
HIP 55720 |
30.52 |
| 2026-05-18 00:00 |
11:30:32.73 |
-69:41:53.5 |
HIP 55720 |
30.51 |
| 2026-05-18 12:00 |
11:30:31.29 |
-69:41:36.2 |
HIP 55771 |
30.36 |
| 2026-05-19 00:00 |
11:30:29.87 |
-69:41:18.9 |
HIP 55771 |
30.10 |
| 2026-05-19 12:00 |
11:30:28.48 |
-69:41:01.5 |
HIP 55771 |
29.84 |
| 2026-05-20 00:00 |
11:30:27.12 |
-69:40:44.0 |
HIP 55771 |
29.59 |
| 2026-05-20 12:00 |
11:30:25.79 |
-69:40:26.5 |
HIP 55771 |
29.34 |
| 2026-05-21 00:00 |
11:30:24.48 |
-69:40:09.0 |
HIP 55771 |
29.09 |
| 2026-05-21 12:00 |
11:30:23.20 |
-69:39:51.4 |
HIP 55771 |
28.85 |
| 2026-05-22 00:00 |
11:30:21.95 |
-69:39:33.8 |
HIP 55771 |
28.61 |
| 2026-05-22 12:00 |
11:30:20.73 |
-69:39:16.1 |
HIP 55771 |
28.37 |
| 2026-05-23 00:00 |
11:30:19.53 |
-69:38:58.4 |
HIP 55771 |
28.14 |
| 2026-05-23 12:00 |
11:30:18.36 |
-69:38:40.7 |
HIP 55771 |
27.91 |
| 2026-05-24 00:00 |
11:30:17.22 |
-69:38:23.0 |
HIP 55771 |
27.68 |
| 2026-05-24 12:00 |
11:30:16.11 |
-69:38:05.2 |
HIP 55771 |
27.45 |
| 2026-05-25 00:00 |
11:30:15.02 |
-69:37:47.3 |
HIP 55771 |
27.23 |
| 2026-05-25 12:00 |
11:30:13.97 |
-69:37:29.5 |
HIP 55771 |
27.02 |
| 2026-05-26 00:00 |
11:30:12.94 |
-69:37:11.6 |
HIP 55771 |
26.80 |
| 2026-05-26 12:00 |
11:30:11.94 |
-69:36:53.7 |
HIP 55771 |
26.59 |
| 2026-05-27 00:00 |
11:30:10.96 |
-69:36:35.7 |
HIP 55771 |
26.39 |
| 2026-05-27 12:00 |
11:30:10.02 |
-69:36:17.8 |
HIP 55771 |
26.19 |
| 2026-05-28 00:00 |
11:30:09.10 |
-69:35:59.8 |
HIP 55771 |
25.99 |
| 2026-05-28 12:00 |
11:30:08.22 |
-69:35:41.8 |
HIP 55771 |
25.80 |
| 2026-05-29 00:00 |
11:30:07.36 |
-69:35:23.7 |
HIP 55771 |
25.61 |
| 2026-05-29 12:00 |
11:30:06.52 |
-69:35:05.7 |
HIP 55771 |
25.42 |
| 2026-05-30 00:00 |
11:30:05.72 |
-69:34:47.6 |
HIP 55771 |
25.24 |
| 2026-05-30 12:00 |
11:30:04.94 |
-69:34:29.5 |
HIP 55771 |
25.07 |
| 2026-05-31 00:00 |
11:30:04.20 |
-69:34:11.4 |
HIP 55771 |
24.90 |
| 2026-05-31 12:00 |
11:30:03.48 |
-69:33:53.3 |
HIP 55771 |
24.74 |
| 2026-06-01 00:00 |
11:30:02.79 |
-69:33:35.2 |
HIP 55771 |
24.58 |
| 2026-06-01 12:00 |
11:30:02.13 |
-69:33:17.1 |
HIP 55771 |
24.42 |
| 2026-06-02 00:00 |
11:30:01.49 |
-69:32:58.9 |
HIP 55771 |
24.27 |