| Parameter |
Value |
| Designation |
C/1949 N1 (Bappu-Bok-Newkirk) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1949-10-26T13:04:54.004800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
30 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1950-05-10.0000000 |
| e |
0.99878218 |
| q (au) |
2.058250 |
| a (au) |
1690.114081 |
| i (deg) |
105.767785 |
| Ω (om, deg) |
309.709849 |
| ω (w, deg) |
89.525738 |
| M (ma, deg) |
0.002773 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.349 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.349 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.987 |
| 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) |
| 2026-03-26 00:00 |
05:51:57.24 |
-43:39:38.5 |
HIP 27578 |
16.42 |
| 2026-03-26 12:00 |
05:51:57.40 |
-43:39:22.2 |
HIP 27578 |
16.50 |
| 2026-03-27 00:00 |
05:51:57.57 |
-43:39:05.9 |
HIP 27578 |
16.57 |
| 2026-03-27 12:00 |
05:51:57.76 |
-43:38:49.6 |
HIP 27578 |
16.66 |
| 2026-03-28 00:00 |
05:51:57.96 |
-43:38:33.4 |
HIP 27578 |
16.75 |
| 2026-03-28 12:00 |
05:51:58.17 |
-43:38:17.1 |
HIP 27843 |
16.84 |
| 2026-03-29 00:00 |
05:51:58.40 |
-43:38:01.0 |
HIP 27843 |
16.73 |
| 2026-03-29 12:00 |
05:51:58.64 |
-43:37:44.8 |
HIP 27843 |
16.61 |
| 2026-03-30 00:00 |
05:51:58.90 |
-43:37:28.6 |
HIP 27843 |
16.50 |
| 2026-03-30 12:00 |
05:51:59.17 |
-43:37:12.5 |
HIP 27843 |
16.39 |
| 2026-03-31 00:00 |
05:51:59.45 |
-43:36:56.4 |
HIP 27843 |
16.28 |
| 2026-03-31 12:00 |
05:51:59.75 |
-43:36:40.4 |
HIP 27843 |
16.18 |
| 2026-04-01 00:00 |
05:52:00.07 |
-43:36:24.4 |
HIP 27843 |
16.07 |
| 2026-04-01 12:00 |
05:52:00.39 |
-43:36:08.4 |
HIP 27843 |
15.97 |
| 2026-04-02 00:00 |
05:52:00.73 |
-43:35:52.4 |
HIP 27843 |
15.87 |
| 2026-04-02 12:00 |
05:52:01.08 |
-43:35:36.5 |
HIP 27843 |
15.77 |
| 2026-04-03 00:00 |
05:52:01.45 |
-43:35:20.6 |
HIP 27843 |
15.67 |
| 2026-04-03 12:00 |
05:52:01.83 |
-43:35:04.7 |
HIP 27843 |
15.57 |
| 2026-04-04 00:00 |
05:52:02.23 |
-43:34:48.9 |
HIP 27843 |
15.48 |
| 2026-04-04 12:00 |
05:52:02.63 |
-43:34:33.1 |
HIP 27843 |
15.38 |
| 2026-04-05 00:00 |
05:52:03.06 |
-43:34:17.4 |
HIP 27843 |
15.29 |
| 2026-04-05 12:00 |
05:52:03.49 |
-43:34:01.7 |
HIP 27843 |
15.20 |
| 2026-04-06 00:00 |
05:52:03.94 |
-43:33:46.1 |
HIP 27843 |
15.12 |
| 2026-04-06 12:00 |
05:52:04.40 |
-43:33:30.5 |
HIP 27843 |
15.03 |
| 2026-04-07 00:00 |
05:52:04.88 |
-43:33:14.9 |
HIP 27843 |
14.95 |
| 2026-04-07 12:00 |
05:52:05.37 |
-43:32:59.4 |
HIP 27843 |
14.87 |
| 2026-04-08 00:00 |
05:52:05.87 |
-43:32:43.9 |
HIP 27843 |
14.79 |
| 2026-04-08 12:00 |
05:52:06.38 |
-43:32:28.5 |
HIP 27843 |
14.71 |
| 2026-04-09 00:00 |
05:52:06.91 |
-43:32:13.1 |
HIP 27843 |
14.64 |
| 2026-04-09 12:00 |
05:52:07.45 |
-43:31:57.8 |
HIP 27843 |
14.56 |
| 2026-04-10 00:00 |
05:52:08.01 |
-43:31:42.5 |
HIP 27843 |
14.49 |
| 2026-04-10 12:00 |
05:52:08.58 |
-43:31:27.2 |
HIP 27843 |
14.43 |
| 2026-04-11 00:00 |
05:52:09.16 |
-43:31:12.1 |
HIP 27843 |
14.36 |
| 2026-04-11 12:00 |
05:52:09.75 |
-43:30:57.0 |
HIP 27843 |
14.30 |
| 2026-04-12 00:00 |
05:52:10.36 |
-43:30:41.9 |
HIP 27843 |
14.24 |
| 2026-04-12 12:00 |
05:52:10.98 |
-43:30:26.9 |
HIP 27843 |
14.18 |
| 2026-04-13 00:00 |
05:52:11.61 |
-43:30:11.9 |
HIP 27843 |
14.13 |
| 2026-04-13 12:00 |
05:52:12.26 |
-43:29:57.0 |
HIP 27843 |
14.07 |
| 2026-04-14 00:00 |
05:52:12.92 |
-43:29:42.2 |
HIP 27843 |
14.02 |
| 2026-04-14 12:00 |
05:52:13.59 |
-43:29:27.4 |
HIP 27843 |
13.98 |
| 2026-04-15 00:00 |
05:52:14.27 |
-43:29:12.7 |
HIP 27843 |
13.93 |
| 2026-04-15 12:00 |
05:52:14.97 |
-43:28:58.1 |
HIP 27843 |
13.89 |
| 2026-04-16 00:00 |
05:52:15.68 |
-43:28:43.5 |
HIP 27843 |
13.85 |