油井 亀美也 Kimiya.Yui engagement report
@Astro_Kimiya - 258K followers on X
Measured over 15 original posts from a 30-day window, last computed on September 8, 2026.
Engagement
A typical post picks up 1.4K interactions against 258K followers, an engagement rate of 0.56%. Measured over 15 original posts, its engagement rate beats 89% of 6,874 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 37K times each, and 3.96% of those impressions turn into an interaction. That is about 14.1% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.5 post a day over the last 30 days, with activity on roughly 50% of days. Most posts go out around 08:00 UTC, and Tuesday is the busiest day of the week. Of the 15 posts sampled, 60% carry an image or video and 7% link out. The account's strongest tracked post pulled 4.7K interactions, about 3.3x its own typical post.
Measured over 15 original posts from a 30-day window, last computed on September 8, 2026.
Compared with accounts its own size
油井 亀美也 Kimiya.Yui's engagement rate beats 89% of the tracked X accounts closest to it in follower count (6,874 accounts, accounts of similar size (decile 7 of 10)). A percentile is spread evenly by construction, so 50 really is the middle of that group and 90 really is its top tenth.
On engagement per impression rather than per follower it beats 84% of the same group. When those two numbers disagree, the gap is about how far its posts travel rather than how people react to them.
Where this sits in the catalog
At 0.56%, 油井 亀美也 Kimiya.Yui sits above the 75th percentile of the 65,980 accounts in this comparison. That places it in the top 25% band, which runs 0.499% to 2.09%.
Show the percentile table
| Percentile | Engagement rate |
|---|---|
| 10th percentile | 0.002% |
| 25th percentile | 0.016% |
| 50th percentile | 0.1% |
| 75th percentile | 0.499% |
| 90th percentile | 2.09% |
| 99th percentile | 120.0% |
This ruler is the whole measured catalog, not a size-matched group: it shows where the raw rate falls across every account we can measure, all of which are large. For a like-for-like comparison, read the size-band percentile above instead. See how the bands are built
Posting timing
This account posts most often around 08:00 UTC, and Tuesday is its busiest day of the week. The bars below are the catalog-wide pattern, with this account's own busiest slot marked. They do not show how this account performs at each hour: we keep one aggregate per account, not one per hour, so that measurement does not exist in our data.
Show engagement by hour posted, utc as a table
| Hour (UTC) | Vs author median | Posts |
|---|---|---|
| 00:00 UTC | -1% | 89K |
| 01:00 UTC | -2% | 90K |
| 02:00 UTC | -3% | 88K |
| 03:00 UTC | -4% | 94K |
| 04:00 UTC | -5% | 76K |
| 05:00 UTC | -4% | 75K |
| 06:00 UTC | -5% | 86K |
| 07:00 UTC | -5% | 93K |
| 08:00 UTC | -4% | 108K |
| 09:00 UTC | -4% | 124K |
| 10:00 UTC | -3% | 129K |
| 11:00 UTC | -3% | 141K |
| 12:00 UTC | -3% | 154K |
| 13:00 UTC | -3% | 167K |
| 14:00 UTC | -4% | 173K |
| 15:00 UTC | -2% | 176K |
| 16:00 UTC | -3% | 171K |
| 17:00 UTC | -3% | 159K |
| 18:00 UTC | -2% | 149K |
| 19:00 UTC | -2% | 141K |
| 20:00 UTC | -1% | 131K |
| 21:00 UTC | 0% | 116K |
| 22:00 UTC | -2% | 100K |
| 23:00 UTC | -1% | 90K |
Show engagement by day of week as a table
| Day | Vs author median | Posts |
|---|---|---|
| Sunday | +5% | 393K |
| Monday | +1% | 483K |
| Tuesday | -2% | 520K |
| Wednesday | -3% | 472K |
| Thursday | -2% | 430K |
| Friday | -3% | 447K |
| Saturday | +2% | 393K |
Formats this account uses
Its own posting mix on the left, and what each of those formats does across every account we track on the right. Only formats where the effect clears our publish test appear here, so an empty row is a format we could not measure rather than one that does nothing.
| Format | This account | Catalog effect | 95% interval | Accounts behind it |
|---|---|---|---|---|
| Image or video | 60% of posts | +111% | +108% to +115% | 34K |
| Outbound link | 7% of posts | -41% | -42% to -40% | 32K |
| Typical length | - | -3% | -3% to -2% | 54K |
- 60% of this account's sampled posts carry an image or video. Across the catalog, posts with an image or video run 111% above the same accounts' other posts.
- 7% of its posts carry a link off X. Across the catalog, posts with an outbound link run 41% below the same accounts' other posts.
- Its average post runs 140 characters, which falls in the 80 - 180 characters band. Across the catalog, posts of 80 to 180 characters run 3% below the same accounts' other posts.
These are catalog-wide differences applied to this account's own posting mix, not a measurement of how each format performs for this account specifically. We keep one median per account, not one per format per account, so the second thing is not something this data can tell you.
Best tweets
- Aug 7, 20263.3x their median
皆さん、こんばんは! 今日家に帰ると、愛犬のくま吉君が夏らしいスタイルにカットされていました。 という事で、動画を共有させていただきます! https://t.co/k2ldwA6O9L
- Jul 8, 20262.9x their median
皆さん、こんばんは! 宇宙ステーション長期滞在後は、滞在中にお休みできなかった分の休暇が取得できる事になっています。 という事で、私も今日から少し長めのお休みを頂く予定です。 何をしようかと、今から楽しみです! 休暇中は、ポストも少なくなると思いますが、ご容赦ください。
- Sep 1, 20262.7x their median
秋山豊寛さんが亡くなられたのですね。。 ソユーズ宇宙船で宇宙へ行くための訓練を受け、宇宙でジャーナリストとして活動するという、世界初の偉業を成し遂げた方として、宇宙開発の歴史に名を刻んでいます。今考えても、かなり先進的な活動ですね。 心より御冥福をお祈り申し上げます。
- Jul 1, 20262.3x their median
皆さん、こんばんは! 仕事を終えて家に帰ると、いつもこの顔が待っていて疲れが吹き飛びます笑。 くまちゃん、癒しをありがとう! https://t.co/764K4RcBL5
- Jul 6, 20262.3x their median
皆さん、こんばんは! 今日は、サラダ記念日ですね。 国語の成績が3だった(10段階評価)私が、この日に短歌を詠むのは、とても勇気がいるのです(笑)。 「富士さんの衣装みながら独り言私の為のおめかしですね」 #MyEarth短歌 https://t.co/ekjETHqdu9
- Aug 5, 20261.9x their median
皆さん、おはようございます! 恥ずかしながら、夏風邪をひいて、お休みをいただいていました。 今日は、久しぶりに筑波宇宙センターへ出勤です! 今週末は、富山県と福島県で講演が予定されていますが、元気になりましたので、安心してくださいね! 皆様方との交流を楽しみにしています! https://t.co/KlUbsNg3OM
- Jun 19, 20261.9x their median
皆さん、こんばんは! 久しぶりに家に帰ると、くま吉が大歓迎して迎えてくれました。 家はいいですね。 https://t.co/FUYNvd4igV
- Aug 25, 20261.8x their median
皆さん、こんばんは! ISSから撮影した何十万枚もの写真ですが、少しづつ整理して皆さんに紹介する事にしました。こちらは、今年の1月2日に撮影した写真です。 そこで問題! この写真に写っている星座は? ヒント:黄道光が写っていますね。日没直後の写真で、この光の中には、冬生まれの方の星占いの星座が。 (答え合わせの期待度が高ければ、画伯が登場するかも?笑)
- Sep 4, 20261.8x their median
皆さん、こんにちは! 飛行機の乗り継ぎ待ちの間に、今自分がいる場所と、最初の目的地を宇宙からの写真で確認しました笑。 ミュンヘンがここで、ヴェローナがここ(写真の編集ができないので、答えを示せずに申し訳ありません)。 https://t.co/np5xpVf074
- Aug 31, 20261.7x their median
皆さん、こんばんは! 今日は、とても短いタイムラプスの紹介です。 昇る北極星を見つけてみてください。 画面の左端に写っているカシオペヤ座を参考にすると良いかもしれません。 中央やや右の北斗七星の一部も参考になるかも。 https://t.co/zfpR5obB4D
Ranked by total interactions across everything we have tracked for this account, which is a longer history than the 30-day window the rates above use. The multiple compares each post to this account's own median.
Buy or sell X accounts - escrow-protected
PlayerSells is an escrow marketplace for X accounts. Every deal is protected, with no middleman risk.
Reading these numbers
A typical post picks up 1.4K interactions against 258K followers, an engagement rate of 0.56%. Measured over 15 original posts, its engagement rate beats 89% of 6,874 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 37K times each, and 3.96% of those impressions turn into an interaction. That is about 14.1% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.5 post a day over the last 30 days, with activity on roughly 50% of days. Most posts go out around 08:00 UTC, and Tuesday is the busiest day of the week. Of the 15 posts sampled, 60% carry an image or video and 7% link out. The account's strongest tracked post pulled 4.7K interactions, about 3.3x its own typical post.
- What is 油井 亀美也 Kimiya.Yui's engagement rate on X?
- 油井 亀美也 Kimiya.Yui (@Astro_Kimiya) has an engagement rate of 0.56%, based on the median interactions across 15 original posts from the last 30 days against 258,368 followers. Replies, reposts and quote-posts of other people are excluded from that sample.
- Is that a good engagement rate?
- At 0.56%, 油井 亀美也 Kimiya.Yui sits above the 75th percentile of the 65,980 accounts in this comparison. Those comparison accounts are all large ones, because our scanning cadence is weighted towards big accounts, so this is a ranking among peers of similar scale rather than a ranking across X.
- Does @Astro_Kimiya have real engagement?
- Its engagement rate beats 89% of the tracked X accounts closest to it in follower count (6,874 accounts), which puts it in the top quarter for its size group. Ranking inside a size band matters because engagement rate falls as accounts grow, so a raw rate would mostly re-measure the follower count. It is a starting point for a look at follower quality, not a verdict on it.
- When does @Astro_Kimiya post?
- Most posts go out around 08:00 UTC, and Tuesday is its busiest day, at roughly 0.5 posts per day across the measured window.