메타데이터
| 항목 |
값 |
| Designation |
48P/Johnson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-12T05:30:24.428160Z |
| Orbit solution date (soln_date, UTC) |
2026-07-07T05:51:27Z |
| Obs used |
2212 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
16.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-03-22.0000000 |
| e |
0.42708734 |
| q (au) |
2.004539 |
| a (au) |
3.498855 |
| i (deg) |
12.207032 |
| Ω (om, deg) |
110.130729 |
| ω (w, deg) |
216.574526 |
| M (ma, deg) |
33.397883 |
밝기
산란 + 전체 선형
$$
M_a = (8.552 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.552 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.874 |
| k |
0.999 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
07:30:37.65 |
+19:22:58.1 |
HIP 36411 |
21.78 |
| 2026-09-20 12:00 |
07:30:59.83 |
+19:22:31.6 |
HIP 36491 |
25.83 |
| 2026-09-21 00:00 |
07:31:21.83 |
+19:22:05.4 |
HIP 36491 |
27.36 |
| 2026-09-21 12:00 |
07:31:43.67 |
+19:21:39.3 |
HIP 36491 |
29.71 |
| 2026-09-22 00:00 |
07:32:05.33 |
+19:21:13.5 |
HIP 36491 |
32.70 |
| 2026-09-22 12:00 |
07:32:26.82 |
+19:20:47.9 |
HIP 36491 |
36.14 |
| 2026-09-23 00:00 |
07:32:48.15 |
+19:20:22.5 |
HIP 36831 |
39.19 |
| 2026-09-23 12:00 |
07:33:09.30 |
+19:19:57.3 |
HIP 36831 |
36.04 |
| 2026-09-24 00:00 |
07:33:30.27 |
+19:19:32.4 |
HIP 36831 |
33.37 |
| 2026-09-24 12:00 |
07:33:51.07 |
+19:19:07.8 |
HIP 36831 |
31.29 |
| 2026-09-25 00:00 |
07:34:11.70 |
+19:18:43.4 |
HIP 36831 |
29.88 |
| 2026-09-25 12:00 |
07:34:32.14 |
+19:18:19.2 |
HIP 37011 |
26.94 |
| 2026-09-26 00:00 |
07:34:52.41 |
+19:17:55.4 |
HIP 37011 |
22.16 |
| 2026-09-26 12:00 |
07:35:12.50 |
+19:17:31.8 |
HIP 37011 |
17.42 |
| 2026-09-27 00:00 |
07:35:32.41 |
+19:17:08.5 |
HIP 37011 |
12.75 |
| 2026-09-27 12:00 |
07:35:52.14 |
+19:16:45.5 |
HIP 37011 |
8.15 |
| 2026-09-28 00:00 |
07:36:11.69 |
+19:16:22.8 |
HIP 37011 |
3.81 |
| 2026-09-28 12:00 |
07:36:31.06 |
+19:16:00.4 |
HIP 37011 |
2.29 |
| 2026-09-29 00:00 |
07:36:50.24 |
+19:15:38.4 |
HIP 37011 |
6.12 |
| 2026-09-29 12:00 |
07:37:09.23 |
+19:15:16.6 |
HIP 37011 |
10.50 |
| 2026-09-30 00:00 |
07:37:28.04 |
+19:14:55.2 |
HIP 37011 |
14.90 |
| 2026-09-30 12:00 |
07:37:46.66 |
+19:14:34.1 |
HIP 37246 |
17.16 |
| 2026-10-01 00:00 |
07:38:05.09 |
+19:14:13.4 |
HIP 37246 |
12.80 |
| 2026-10-01 12:00 |
07:38:23.33 |
+19:13:53.1 |
HIP 37246 |
8.48 |
| 2026-10-02 00:00 |
07:38:41.38 |
+19:13:33.1 |
HIP 37246 |
4.21 |
| 2026-10-02 12:00 |
07:38:59.24 |
+19:13:13.4 |
HIP 37246 |
0.17 |
| 2026-10-03 00:00 |
07:39:16.90 |
+19:12:54.2 |
HIP 37246 |
4.21 |
| 2026-10-03 12:00 |
07:39:34.37 |
+19:12:35.4 |
HIP 37246 |
8.34 |
| 2026-10-04 00:00 |
07:39:51.64 |
+19:12:16.9 |
HIP 37381 |
11.94 |
| 2026-10-04 12:00 |
07:40:08.71 |
+19:11:58.9 |
HIP 37381 |
10.14 |
| 2026-10-05 00:00 |
07:40:25.58 |
+19:11:41.3 |
HIP 37381 |
9.78 |
| 2026-10-05 12:00 |
07:40:42.26 |
+19:11:24.1 |
HIP 37381 |
10.95 |
| 2026-10-06 00:00 |
07:40:58.73 |
+19:11:07.3 |
HIP 37381 |
13.20 |
| 2026-10-06 12:00 |
07:41:14.99 |
+19:10:51.0 |
HIP 37381 |
16.05 |
| 2026-10-07 00:00 |
07:41:31.05 |
+19:10:35.1 |
HIP 37381 |
19.21 |
| 2026-10-07 12:00 |
07:41:46.91 |
+19:10:19.7 |
HIP 37381 |
22.52 |
| 2026-10-08 00:00 |
07:42:02.56 |
+19:10:04.8 |
HIP 37644 |
21.60 |
| 2026-10-08 12:00 |
07:42:18.00 |
+19:09:50.3 |
HIP 37644 |
18.24 |
| 2026-10-09 00:00 |
07:42:33.22 |
+19:09:36.4 |
HIP 37644 |
15.07 |
| 2026-10-09 12:00 |
07:42:48.24 |
+19:09:22.9 |
HIP 37644 |
12.17 |
| 2026-10-10 00:00 |
07:43:03.05 |
+19:09:09.9 |
HIP 37644 |
9.74 |
| 2026-10-10 12:00 |
07:43:17.64 |
+19:08:57.5 |
HIP 37644 |
8.15 |
| 2026-10-11 00:00 |
07:43:32.02 |
+19:08:45.5 |
HIP 37644 |
7.84 |