메타데이터
| 항목 |
값 |
| Designation |
C/1978 C1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-03-17T16:34:51.617280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
9.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1978-02-23.0000000 |
| e |
1.00000000 |
| q (au) |
0.436574 |
| a (au) |
- |
| i (deg) |
51.086724 |
| Ω (om, deg) |
260.497948 |
| ω (w, deg) |
48.706509 |
| M (ma, deg) |
- |
밝기
산란 + 전체 선형
$$
M_a = (7.306 + 3.467\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.306 |
| n |
3.467 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.971 |
| 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) |
| 2026-07-29 00:00 |
07:04:36.08 |
-07:08:02.3 |
HIP 34027 |
19.87 |
| 2026-07-29 12:00 |
07:04:37.54 |
-07:08:08.8 |
HIP 34027 |
20.21 |
| 2026-07-30 00:00 |
07:04:39.00 |
-07:08:15.4 |
HIP 34027 |
20.56 |
| 2026-07-30 12:00 |
07:04:40.45 |
-07:08:22.1 |
HIP 34027 |
20.91 |
| 2026-07-31 00:00 |
07:04:41.90 |
-07:08:28.9 |
HIP 34027 |
21.26 |
| 2026-07-31 12:00 |
07:04:43.34 |
-07:08:35.8 |
HIP 34027 |
21.61 |
| 2026-08-01 00:00 |
07:04:44.78 |
-07:08:42.7 |
HIP 34027 |
21.96 |
| 2026-08-01 12:00 |
07:04:46.21 |
-07:08:49.7 |
HIP 34027 |
22.31 |
| 2026-08-02 00:00 |
07:04:47.64 |
-07:08:56.9 |
HIP 34027 |
22.67 |
| 2026-08-02 12:00 |
07:04:49.06 |
-07:09:04.0 |
HIP 34027 |
23.02 |
| 2026-08-03 00:00 |
07:04:50.47 |
-07:09:11.3 |
HIP 34027 |
23.37 |
| 2026-08-03 12:00 |
07:04:51.89 |
-07:09:18.7 |
HIP 34027 |
23.73 |
| 2026-08-04 00:00 |
07:04:53.29 |
-07:09:26.1 |
HIP 34279 |
23.91 |
| 2026-08-04 12:00 |
07:04:54.69 |
-07:09:33.6 |
HIP 34279 |
23.54 |
| 2026-08-05 00:00 |
07:04:56.08 |
-07:09:41.2 |
HIP 34279 |
23.17 |
| 2026-08-05 12:00 |
07:04:57.47 |
-07:09:48.9 |
HIP 34279 |
22.81 |
| 2026-08-06 00:00 |
07:04:58.85 |
-07:09:56.6 |
HIP 34279 |
22.44 |
| 2026-08-06 12:00 |
07:05:00.23 |
-07:10:04.5 |
HIP 34279 |
22.08 |
| 2026-08-07 00:00 |
07:05:01.60 |
-07:10:12.4 |
HIP 34279 |
21.71 |
| 2026-08-07 12:00 |
07:05:02.96 |
-07:10:20.4 |
HIP 34279 |
21.35 |
| 2026-08-08 00:00 |
07:05:04.32 |
-07:10:28.4 |
HIP 34279 |
20.99 |
| 2026-08-08 12:00 |
07:05:05.66 |
-07:10:36.6 |
HIP 34279 |
20.63 |
| 2026-08-09 00:00 |
07:05:07.01 |
-07:10:44.8 |
HIP 34279 |
20.26 |
| 2026-08-09 12:00 |
07:05:08.34 |
-07:10:53.1 |
HIP 34279 |
19.91 |
| 2026-08-10 00:00 |
07:05:09.67 |
-07:11:01.4 |
HIP 34279 |
19.55 |
| 2026-08-10 12:00 |
07:05:11.00 |
-07:11:09.9 |
HIP 34279 |
19.19 |
| 2026-08-11 00:00 |
07:05:12.31 |
-07:11:18.4 |
HIP 34279 |
18.83 |
| 2026-08-11 12:00 |
07:05:13.62 |
-07:11:27.0 |
HIP 34279 |
18.48 |
| 2026-08-12 00:00 |
07:05:14.92 |
-07:11:35.6 |
HIP 34279 |
18.13 |
| 2026-08-12 12:00 |
07:05:16.22 |
-07:11:44.4 |
HIP 34279 |
17.77 |
| 2026-08-13 00:00 |
07:05:17.50 |
-07:11:53.2 |
HIP 34279 |
17.42 |
| 2026-08-13 12:00 |
07:05:18.78 |
-07:12:02.0 |
HIP 34279 |
17.07 |
| 2026-08-14 00:00 |
07:05:20.05 |
-07:12:11.0 |
HIP 34279 |
16.72 |
| 2026-08-14 12:00 |
07:05:21.32 |
-07:12:20.0 |
HIP 34279 |
16.38 |
| 2026-08-15 00:00 |
07:05:22.57 |
-07:12:29.1 |
HIP 34279 |
16.03 |
| 2026-08-15 12:00 |
07:05:23.82 |
-07:12:38.2 |
HIP 34279 |
15.69 |
| 2026-08-16 00:00 |
07:05:25.06 |
-07:12:47.4 |
HIP 34279 |
15.34 |
| 2026-08-16 12:00 |
07:05:26.29 |
-07:12:56.7 |
HIP 34279 |
15.00 |
| 2026-08-17 00:00 |
07:05:27.52 |
-07:13:06.0 |
HIP 34279 |
14.66 |
| 2026-08-17 12:00 |
07:05:28.73 |
-07:13:15.5 |
HIP 34279 |
14.32 |
| 2026-08-18 00:00 |
07:05:29.94 |
-07:13:24.9 |
HIP 34279 |
13.99 |
| 2026-08-18 12:00 |
07:05:31.14 |
-07:13:34.5 |
HIP 34279 |
13.65 |
| 2026-08-19 00:00 |
07:05:32.33 |
-07:13:44.1 |
HIP 34279 |
13.32 |