메타데이터
| 항목 |
값 |
| Designation |
C/2018 B1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-30T10:39:55.339200Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
316 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-10-22.0000000 |
| e |
1.00296934 |
| q (au) |
5.116718 |
| a (au) |
-1723.183540 |
| i (deg) |
162.423569 |
| Ω (om, deg) |
133.168875 |
| ω (w, deg) |
68.349093 |
| M (ma, deg) |
0.002832 |
밝기
산란 + 전체 선형
$$
M_a = (15.479 + 2.127\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.479 |
| n |
2.127 |
| gf |
1.000 |
| gb |
-0.810 |
| k |
0.800 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2017-01-16 |
2018-03-03 |
+44.9933 |
-31.597 |
| 2018-08-17 |
2019-10-31 |
+3.0484 |
-2.392 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:52:56.53 |
-19:24:29.3 |
HIP 103032 |
10.01 |
| 2026-06-01 12:00 |
20:52:52.36 |
-19:24:53.8 |
HIP 103032 |
9.05 |
| 2026-06-02 00:00 |
20:52:48.13 |
-19:25:18.5 |
HIP 103032 |
8.11 |
| 2026-06-02 12:00 |
20:52:43.85 |
-19:25:43.3 |
HIP 103032 |
7.19 |
| 2026-06-03 00:00 |
20:52:39.53 |
-19:26:08.4 |
HIP 103032 |
6.32 |
| 2026-06-03 12:00 |
20:52:35.15 |
-19:26:33.6 |
HIP 103032 |
5.53 |
| 2026-06-04 00:00 |
20:52:30.73 |
-19:26:59.0 |
HIP 103032 |
4.87 |
| 2026-06-04 12:00 |
20:52:26.25 |
-19:27:24.6 |
HIP 103032 |
4.39 |
| 2026-06-05 00:00 |
20:52:21.73 |
-19:27:50.4 |
HIP 103032 |
4.18 |
| 2026-06-05 12:00 |
20:52:17.16 |
-19:28:16.3 |
HIP 103032 |
4.28 |
| 2026-06-06 00:00 |
20:52:12.54 |
-19:28:42.4 |
HIP 103032 |
4.68 |
| 2026-06-06 12:00 |
20:52:07.87 |
-19:29:08.7 |
HIP 103032 |
5.33 |
| 2026-06-07 00:00 |
20:52:03.16 |
-19:29:35.2 |
HIP 103032 |
6.14 |
| 2026-06-07 12:00 |
20:51:58.40 |
-19:30:01.8 |
HIP 103032 |
7.08 |
| 2026-06-08 00:00 |
20:51:53.59 |
-19:30:28.6 |
HIP 103032 |
8.10 |
| 2026-06-08 12:00 |
20:51:48.73 |
-19:30:55.5 |
HIP 103032 |
9.17 |
| 2026-06-09 00:00 |
20:51:43.83 |
-19:31:22.6 |
HIP 103032 |
10.30 |
| 2026-06-09 12:00 |
20:51:38.88 |
-19:31:49.9 |
HIP 103018 |
11.08 |
| 2026-06-10 00:00 |
20:51:33.88 |
-19:32:17.4 |
HIP 103018 |
11.78 |
| 2026-06-10 12:00 |
20:51:28.84 |
-19:32:45.0 |
HIP 103018 |
12.58 |
| 2026-06-11 00:00 |
20:51:23.75 |
-19:33:12.7 |
HIP 103018 |
13.46 |
| 2026-06-11 12:00 |
20:51:18.62 |
-19:33:40.6 |
HIP 103018 |
14.41 |
| 2026-06-12 00:00 |
20:51:13.44 |
-19:34:08.7 |
HIP 103018 |
15.42 |
| 2026-06-12 12:00 |
20:51:08.21 |
-19:34:36.9 |
HIP 103018 |
16.48 |
| 2026-06-13 00:00 |
20:51:02.94 |
-19:35:05.3 |
HIP 103018 |
17.58 |
| 2026-06-13 12:00 |
20:50:57.63 |
-19:35:33.8 |
HIP 103018 |
18.73 |
| 2026-06-14 00:00 |
20:50:52.27 |
-19:36:02.5 |
HIP 103018 |
19.91 |
| 2026-06-14 12:00 |
20:50:46.87 |
-19:36:31.3 |
HIP 103018 |
21.11 |
| 2026-06-15 00:00 |
20:50:41.42 |
-19:37:00.3 |
HIP 103018 |
22.35 |
| 2026-06-15 12:00 |
20:50:35.94 |
-19:37:29.4 |
HIP 103018 |
23.61 |
| 2026-06-16 00:00 |
20:50:30.40 |
-19:37:58.6 |
HIP 103018 |
24.89 |
| 2026-06-16 12:00 |
20:50:24.83 |
-19:38:28.0 |
HIP 103018 |
26.20 |
| 2026-06-17 00:00 |
20:50:19.22 |
-19:38:57.5 |
HIP 103018 |
27.52 |
| 2026-06-17 12:00 |
20:50:13.56 |
-19:39:27.2 |
HIP 103018 |
28.86 |
| 2026-06-18 00:00 |
20:50:07.86 |
-19:39:57.0 |
HIP 103018 |
30.22 |
| 2026-06-18 12:00 |
20:50:02.12 |
-19:40:26.9 |
HIP 103018 |
31.59 |
| 2026-06-19 00:00 |
20:49:56.35 |
-19:40:56.9 |
HIP 103018 |
32.98 |
| 2026-06-19 12:00 |
20:49:50.53 |
-19:41:27.1 |
HIP 103018 |
34.39 |
| 2026-06-20 00:00 |
20:49:44.67 |
-19:41:57.4 |
HIP 102660 |
33.97 |
| 2026-06-20 12:00 |
20:49:38.77 |
-19:42:27.8 |
HIP 102660 |
33.52 |
| 2026-06-21 00:00 |
20:49:32.83 |
-19:42:58.4 |
HIP 102660 |
33.12 |
| 2026-06-21 12:00 |
20:49:26.86 |
-19:43:29.0 |
HIP 102660 |
32.78 |
| 2026-06-22 00:00 |
20:49:20.85 |
-19:43:59.8 |
HIP 102660 |
32.50 |